Same issues here,
I've been playing this game for about 1 month now, had absolutly no issues what soever until yesterday i got this app crash, i ignored it (was at my mates and pretty wasted lol)
Today (sobered up) i tried again, and its happening quite a lot, but seemingly random - always during matches.
My system:
MSI Z87-G45 Gaming Motherboard
Intel core i7 4770k @ 3.9GHz
nVidia Geforce GTX 780Ti Superclocked
Corsair Vengence 16GB
OCZ Vector 480GB SSD 2x in raid0
All settings are ultra, "Insane" Texture Quality at 1080p Resolution vSync: ON @ 80Hz
All water cooled, temps are definetly fine (Cpu/GPU Both below 45 at 100% usage) and my overclocks are 99.99% stable
Windows 7 Ultimate, all updates installed (apart from a few Visual studio ones i refuse to install for developer reasons)
Faulting module name: materialsystem_dx11.dll
So it seems to me if they claim to have fixed this in a previous patch why are people still experiencing it?
Also why would it randomly start happening? Nothing is different on my system from 2 days ago when i played 10-15 matches in a row without a single crash.