Same on my GTX 660.
The console is an unending stream of this even on the main menu:
[Assert] C:\buildworker\citadel_rel_win64\build\src\rendersystem\dx\rendercontextdx11_software.cpp (1460) : AssertMsg Failed in function CRenderContextDx11_SoftwareCommandLists::DispatchComputeShader():
Trying...
