I just had this DX Error when alt-tabbing. I am running a GTX 460.
Here is a snip from the Debug.err. I can post more of it if you need it but this is the end where it looks like the error occurs. I am using Windows 7 64-bit.
Debug Message: - Ending Turn 12 -
Debug Message: Current Memory Usage: 846720 KB
Debug Message: Cities in World: 10
Debug Message: Units in World: 196
DebugMessage: Updating ZOC.
DebugMessage: Popup Manager Update: Unhiding ConversationPopupWnd
Debug Message: Unit Jasper Tilmin traded from NPC Player to Kingdom of Altar.
Debug Message: Forest: Forest! | Tile Direction: 4
Debug Message: -------------------------
Debug Message: - Ending Turn 13 -
Debug Message: Current Memory Usage: 864424 KB
Debug Message: Cities in World: 10
Debug Message: Units in World: 202
DebugMessage: Updating ZOC.
DebugMessage: Error flipping back buffer to primary buffer.
DebugMessage: Device lost
Debug Message: ResourceManager::Invalidate
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\editor_tilegraphic.fx has 8 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\AnimatedLeafBatch.fxo has 22 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\ElementalAnimationNode.fxo has 101 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\ElementalBatch.fxo has 129 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\ElementalBatchLighting.fxo has 143 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\ElementalBatchLightingPewter.fxo has 143 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\MapText.fxo has 3 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\MedallionBox.fxo has 17 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\ScreenSpace.fxo has 28 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\TolkienMap_EdgeDetect.fxo has 18 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\ZOC_shaders.fxo has 10 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\decal.fxo has 23 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\effectSystemShaders.fxo has 81 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\forest_icon_batch.fxo has 13 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\post_bloom.fxo has 32 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\post_hdr.fxo has 31 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\post_radialBlur.fxo has 17 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\post_sepia.fxo has 15 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\selection_cursor.fxo has 15 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\tactical_icon_batch.fxo has 13 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\terrain_shaders_3_0.fxo has 351 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\fxo\water_shaders.fxo has 102 refs
Debug Message: effect: C:\Program Files (x86)\Stardock Games\Elemental\Gfx\fx\post_cameraShake.fx has 17 refs
Debug Message: D3DXLine MainUI_MainMap has ref count 2
Debug Message: Device has been lost
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: ValidateDevice::Reset
DebugMessage: DX Error: Invalid call
Debug Message: ERROR: (CGFXBuffer9) Unable to map a vertex buffer for reading/writing.
Debug Message: ERROR: (CGFXBuffer9) Unable to map a vertex buffer for reading/writing.
Debug Message: ERROR: Failed to set ambient color to -1 in ::SetAmbientColor
DebugMessage: Error flipping back buffer to primary buffer.
DebugMessage: Invalid call
DebugMessage: Main Shell terminating normally
DebugMessage: Not all child windows deleted for window ID: 0, pos 0, 0, size 1680, 1050.
DebugMessage: Child CityHUDWnd with ID: 3, pos 0, 0, size 200, 54.
DebugMessage: Child StackedUnitHudWnd with ID: 17, pos 0, 0, size 36, 36.
DebugMessage: Child BGBinkWnd with ID: 27, pos 0, 0, size 1680, 1050.
DebugMessage: Child CustomizeCrestWnd with ID: 33, pos 0, 0, size 1680, 1050.
DebugMessage: Child ImageSelectWnd with ID: 37, pos 0, 0, size 1680, 1050.
DebugMessage: Child AdvancedChooseFactionWnd with ID: 55, pos 0, 0, size 1680, 1050.
DebugMessage: Child AdvancedChooseOpponentWnd with ID: 59, pos 0, 0, size 1680, 1050.
DebugMessage: Child WorkshopWnd with ID: 63, pos 0, 0, size 1680, 1050.
DebugMessage: Child GameLobbyWnd with ID: 65, pos 0, 0, size 1680, 1050.
DebugMessage: Child MultiplayerGameListWnd with ID: 67, pos 0, 0, size 1680, 1050.
DebugMessage: Child PasswordDialogWnd with ID: 69, pos 0, 0, size 1680, 1050.
DebugMessage: Child CampaignManagementWnd with ID: 73, pos 0, 0, size 1680, 1050.
DebugMessage: Child ResourceMarketWnd with ID: 493, pos 0, 0, size 1680, 1050.
DebugMessage: Child InfoWnd with ID: 495, pos 0, 0, size 1680, 1050.
DebugMessage: Child UnitDetailsEquipWnd with ID: 497, pos 0, 0, size 1680, 1050.
DebugMessage: Child SpellBookPopupWnd with ID: 503, pos 0, 0, size 1680, 1050.
DebugMessage: Child TacticalWnd with ID: 509, pos 0, 0, size 1680, 1050.
DebugMessage: Child TacticalTrayWnd with ID: 519, pos 0, 0, size 1680, 1050.
DebugMessage: Child UnitEquipmentWnd with ID: 521, pos 0, 0, size 1680, 1050.
DebugMessage: Child DiplomacyWnd with ID: 545, pos 0, 0, size 1680, 1050.
DebugMessage: Child BuyPopupWnd with ID: 547, pos 0, 0, size 1680, 1050.
DebugMessage: Child ItemShopWnd with ID: 549, pos 0, 0, size 1680, 1050.
DebugMessage: Child InfoCardSaveWnd with ID: 553, pos 0, 0, size 1680, 1050.
DebugMessage: Child LevelUpWnd with ID: 555, pos 0, 0, size 1680, 1050.
DebugMessage: Child CityLevelUpWnd with ID: 557, pos 0, 0, size 1680, 1050.
DebugMessage: Child SpellLevelUpWnd with ID: 559, pos 0, 0, size 1680, 1050.
DebugMessage: Child LightingWnd with ID: 565, pos 0, 0, size 1680, 1050.
DebugMessage: Child BattleInitiationWnd with ID: 567, pos 0, 0, size 1680, 1050.
DebugMessage: Child BattleResolutionWnd with ID: 569, pos 0, 0, size 1680, 1050.
DebugMessage: Child ReportWnd with ID: 571, pos 0, 0, size 1680, 1050.
DebugMessage: Child GameOverWnd with ID: 573, pos 0, 0, size 1680, 1050.
DebugMessage: Child BreakthroughWnd with ID: 577, pos 0, 0, size 1680, 1050.
DebugMessage: Child NewTechWnd with ID: 579, pos 0, 0, size 1680, 1050.
DebugMessage: Child MainWndUnitListWnd with ID: 583, pos 0, 0, size 1680, 1050.
DebugMessage: Child TradeEquipmentWnd with ID: 587, pos 0, 0, size 1680, 1050.
DebugMessage: Child ItemEditorWnd with ID: 589, pos 0, 0, size 1680, 1050.
DebugMessage: Child MapEditorWnd with ID: 591, pos 0, 0, size 1680, 1050.
DebugMessage: Child TileEditWnd with ID: 593, pos 0, 0, size 1680, 1050.
DebugMessage: Child ParticleEditorWnd with ID: 609, pos 0, 0, size 1680, 1050.
DebugMessage: Child FlavorTextEditorListWnd with ID: 611, pos 0, 0, size 1680, 1050.
DebugMessage: Child FlavorTextEditWnd with ID: 613, pos 0, 0, size 1680, 1050.
DebugMessage: Child ModifierWnd with ID: 615, pos 0, 0, size 1680, 1050.
DebugMessage: Child ChatDialogWnd with ID: 617, pos 70, 385, size 280, 280.
DebugMessage: Child GenericToolTipWin with ID: 9999, pos 0, 0, size 100, 100.
DebugMessage: Child EventListEntryToolTipWnd with ID: 626, pos 0, 0, size 1680, 1050.
DebugMessage: Child FullScreenBink with ID: 1, pos 0, 0, size 1680, 1050.
DebugMessage: Child CreateSovereignWnd with ID: 43, pos 0, 0, size 1680, 1050.
DebugMessage: Child ColorPickerWnd with ID: 35, pos 885, 506, size 484, 255.
DebugMessage: Child InfoCardSaveWnd with ID: 575, pos 0, 0, size 1680, 1050.
DebugMessage: Child OptionsWnd with ID: 61, pos 0, 0, size 1680, 1050.
DebugMessage: Child TitleWnd with ID: 29, pos 0, 0, size 1680, 1050.
DebugMessage: Child WorldSetupWnd with ID: 39, pos 0, 0, size 1680, 1050.
DebugMessage: Child LoadWnd with ID: 71, pos 0, 0, size 1680, 1050.
DebugMessage: Child ChooseSovereignWnd with ID: 41, pos 0, 0, size 1680, 1050.
DebugMessage: Child ChooseFactionWnd with ID: 53, pos 0, 0, size 1680, 1050.
DebugMessage: Child CustomizeFactionWnd with ID: 31, pos 0, 0, size 1680, 1050.
DebugMessage: Child ChooseOpponentWnd with ID: 57, pos 0, 0, size 1680, 1050.
DebugMessage: Child LoadingWnd with ID: 25, pos 0, 0, size 1680, 1050.
DebugMessage: Child MainGameWnd with ID: 460, pos 0, 0, size 1680, 1050.
DebugMessage: Child MainGameTrayWnd with ID: 491, pos 0, 0, size 1680, 23.
DebugMessage: Child MessageBoxNameWnd with ID: 551, pos 0, 0, size 1680, 1050.
DebugMessage: Child AIMessageWnd with ID: 561, pos 0, 0, size 1680, 1050.
DebugMessage: Child TrainUnitWnd with ID: 563, pos 0, 645, size 324, 382.
DebugMessage: Child MessageBoxWnd with ID: 22, pos 0, 0, size 1680, 1050.
DebugMessage: Child CutSceneWnd with ID: 585, pos 0, 0, size 1680, 1050.
DebugMessage: Child KingdomWnd with ID: 523, pos 0, 0, size 1680, 1050.
DebugMessage: Child LoreBookPopupWnd with ID: 499, pos 0, 0, size 1680, 1050.
DebugMessage: Child BasicToolTipWnd with ID: 620, pos 776, 934, size 145, 35.
DebugMessage: Child ConversationPopupWnd with ID: 581, pos 0, 0, size 1680, 1050.
DebugMessage: Child InfoNoteWnd with ID: 624, pos 1424, 955, size 256, 72.
DebugMessage: Child InfoCardWnd with ID: 622, pos 1424, 707, size 256, 320.
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Unallocated Mem: 1404 bytes of memory from line 222 of E:\Elemental\Kumquat3D\Source\AStarManager.cpp
DebugMessage: Not all memory has been freed from memory system AStar.
DebugMessage: 29484 bytes of memory still allocated.