Railworks 2 in Game Mode
Railworks 2 used to work in Game Mode.  Without Game Mode turned on, I'd get a Bitdefender popup to say it had terminated a 'csc.exe' file because it was deemed harmful and I'd get an Unhandled Exception error as Railworks itself opened.
After a fresh install of Steam and Railworks, (because the Steam client seemed a bit slow to connect and update with their servers), I get the Unhandled Exception even with Bitdefender Game Mode turned on.
The Steam client works fine.  The problem occurs when I launch Railworks 2 itself.

The Unhandled Exception seems to be failing to find a .dll file in my 
'AppData/Temp/ folder.  Each time this happens, the name of the .dll file changes, (which is probably normal).
Railworks support have done all they can.  Therefore, I can't eliminate Bitdefender from being the cause, especially since the Unhandled Exception used to happen with Game Mode off and then not happen with Game Mode on.
I have Bitdefender Total Security 2011.
Operating System:	Windows 7 Professional, 64-bit (Service Pack 1)
DirectX version:	11.0 
GPU processor:		GeForce GT 430
Driver version:		275.33
DirectX support:	11
CUDA Cores:		96 
Core clock:		700 MHz 
Shader clock:		1400 MHz
Memory clock:		700 MHz (1400 MHz data rate) 
Memory interface:	128-bit 
Total available graphics memory:	2815 MB
Dedicated video memory:	1024 MB DDR3
System video memory:	0 MB
Shared system memory:	1791 MB
Video BIOS version:	70.08.29.00.30
IRQ:			16
Bus:			PCI Express x16 Gen2
Please let me know if you require any further information.
Goff