Confirmed, I got exactly the same thing. Windows XP

me too same problem with same message error with vista 64bit.

ps: game seems awesome:P

Yeah, fullscreen, I imagine this wouldn't be a problem in windowed mode.

Same thing here, Windows 7 64, Geforce 9800 GTX (197.45 drivers)

Same error and general conditions.

Vista x64.

Same here.  Happened when a Gtalk IM was sent to me and it minimized the game.  It did not error out until I tried to expand the game again.  Then I received a dialog box titled Fatal Error:  DX Error: Invalid call.

Item Value 
OS Name Microsoft Windows 7 Home Premium 64bit
Version 6.1.7600 Build 7600 
Other OS Description  Not Available 
OS Manufacturer Microsoft Corporation 
System Name ENTERPRISE 
System Manufacturer NVIDIA 
System Model 132-CK-NF78 
System Type x64-based PC 
Processor Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz, 3037 Mhz, 4 Core(s), 4 Logical Processor(s) 
BIOS Version/Date Phoenix Technologies, LTD P08, 9/9/2008 
SMBIOS Version 2.4 
Windows Directory C:\Windows 
System Directory C:\Windows\system32 
Boot Device \Device\HarddiskVolume2 
Locale United States 
Hardware Abstraction Layer Version = "6.1.7600.16385" 
User Name Enterprise\Viper 
Time Zone Pacific Daylight Time 
Installed Physical Memory (RAM) 8.00 GB 
Total Physical Memory 8.00 GB 
Available Physical Memory 4.72 GB 
Total Virtual Memory 16.0 GB 
Available Virtual Memory 12.0 GB 
Page File Space 8.00 GB 
Page File C:\pagefile.sys 

Name ATI Radeon HD 5800 Series 
PNP Device ID PCI\VEN_1002&DEV_6898&SUBSYS_0B001002&REV_00\6&689986E&0&00000018 
Adapter Type ATI display adapter (0x6898), ATI Technologies Inc. compatible 
Adapter Description ATI Radeon HD 5800 Series 
Adapter RAM 1.00 GB (1,073,741,824 bytes) 
Installed Drivers atiu9p64.dll,aticfx64.dll,aticfx64.dll,atiu9pag,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll 
Driver Version 8.712.0.0 
INF File oem29.inf (ati2mtag_Evergreen section) 
Color Planes Not Available 
Color Table Entries 4294967296 
Resolution 1920 x 1200 x 60 hertz 
Bits/Pixel 32 
Memory Address 0xB0000000-0xBFFFFFFF 
Memory Address 0xCFEC0000-0xCFEDFFFF 
I/O Port 0x00009C00-0x00009CFF 
IRQ Channel IRQ 4294967292 
I/O Port 0x000003B0-0x000003BB 
I/O Port 0x000003C0-0x000003DF 
Memory Address 0xA0000-0xBFFFF 
Driver c:\windows\system32\drivers\atikmpag.sys (8.14.1.6099, 184.50 KB (188,928 bytes), 3/2/2010 7:07 PM)

Same problem using Windows 7 64 Bit, GeForce GTX 260 (driver 8.17.11.9745).

Same issue

Vista 64bit

ATI 4870x2 HD

Catalyst 10.5

Same here. Windows 7 64bit, Geforce 260

I think there's probably enough data by now, but for completeness' sake:

Same, Win7 64 bit, 8gb mem, ATI 4850, AMD Phenom 2 quad core

Yeah, I confirmed this as well on both my XP desktop, and my Vista Laptop.

Replicated-- Win 7 64-bit.