I get the same error, i don't get the problem signature though. For me it just says "legendary heroes has stopped working". Happens right after the intro videos finish.

I've had a support case open for just over a week now too, its a slow process

Here's what I get after about 30 minutes to an hour of gameplay.

System specs:

i7 2600k

16g RAM GSkill Snipers

256g Vertex SSD

nVidia Geforce GTX 570

1100W Corsair PSU

(in other words I don't think it is my system lacking the specs to run it properly)

Log Name: Application
Source: Application Hang
Date: 6/15/2013 12:06:42 AM
Event ID: 1002
Task Category: (101)
Level: Error
Keywords: Classic
User: N/A
Computer: Shane_Home
Description:
The program LegendaryHeroes.exe version 1.1.0.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: 488
Start Time: 01ce697c211a7926
Termination Time: 228
Application Path: C:\Program Files (x86)\Steam\steamapps\common\FE Legendary Heroes\LegendaryHeroes.exe
Report Id: 575fe6ae-d579-11e2-a222-f46d04ae0a41

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Hang" />
<EventID Qualifiers="0">1002</EventID>
<Level>2</Level>
<Task>101</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2013-06-15T05:06:42.000000000Z" />
<EventRecordID>5418</EventRecordID>
<Channel>Application</Channel>
<Computer>Shane_Home</Computer>
<Security />
</System>
<EventData>
<Data>LegendaryHeroes.exe</Data>
<Data>1.1.0.0</Data>
<Data>488</Data>
<Data>01ce697c211a7926</Data>
<Data>228</Data>
<Data>C:\Program Files (x86)\Steam\steamapps\common\FE Legendary Heroes\LegendaryHeroes.exe</Data>
<Data>575fe6ae-d579-11e2-a222-f46d04ae0a41</Data>
<Binary>55006E006B006E006F0077006E0000000000</Binary>
</EventData>
</Event>

Ok, this will be the last one I post for the night. Restarted my game from an earlier save (and lost progress only to have it crash immediately after I took my first action (moving pioneers into the fort)

Also I just realized I haven't mentioned that I am running Win7 64.

Anyway, I'm starting to get a little sad that I can't play for more than 30 minutes at a time without it crashing.

Log Name: Application
Source: Application Error
Date: 6/15/2013 1:27:24 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Shane_Home
Description:
Faulting application name: LegendaryHeroes.exe, version: 1.1.0.0, time stamp: 0x51adfad1
Faulting module name: nvd3dum.dll, version: 9.18.13.2018, time stamp: 0x518fe5d3
Exception code: 0xc0000005
Fault offset: 0x005c0e5e
Faulting process id: 0x8f0
Faulting application start time: 0x01ce6991478662b7
Faulting application path: C:\Program Files (x86)\Steam\steamapps\common\FE Legendary Heroes\LegendaryHeroes.exe
Faulting module path: C:\Windows\system32\nvd3dum.dll
Report Id: a39db084-d584-11e2-a222-f46d04ae0a41
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2013-06-15T06:27:24.000000000Z" />
<EventRecordID>5423</EventRecordID>
<Channel>Application</Channel>
<Computer>Shane_Home</Computer>
<Security />
</System>
<EventData>
<Data>LegendaryHeroes.exe</Data>
<Data>1.1.0.0</Data>
<Data>51adfad1</Data>
<Data>nvd3dum.dll</Data>
<Data>9.18.13.2018</Data>
<Data>518fe5d3</Data>
<Data>c0000005</Data>
<Data>005c0e5e</Data>
<Data>8f0</Data>
<Data>01ce6991478662b7</Data>
<Data>C:\Program Files (x86)\Steam\steamapps\common\FE Legendary Heroes\LegendaryHeroes.exe</Data>
<Data>C:\Windows\system32\nvd3dum.dll</Data>
<Data>a39db084-d584-11e2-a222-f46d04ae0a41</Data>
</EventData>
</Event>

If you're experiencing crashes, please provide your debug.err file and any crash dumps that are generated as described in this thread (only difference is that they'll be in Legendary Heroes folders, rather than Fallen Enchantress). Event Log entries aren't very helpful on their own.