I have tried switching between dev, and normal build, but seemed to get the error on both version, I have also verified the game files through steam. At first it said I had two files missing, but even after downloading the missing files and confirming again the all files were correct, I am still having these problems.
I cant upload the RPT as it is 17000k in size, and there is a 2000k limit on here. Will update this post with the RPT file if I can.
UPDATE:
This problem now appears to have solved itself. No idea how, I did nothing since posting this. However it now appears the bug has gone. There are no more graphical problems, and the game is playable again. I have changed ability to reproduce problem from always to random. This is no longer a crash report, merely an annoying bug report.