well i had a server problem but its fixed now but i still have this problem every time i kill one of the purple souls my game crashes, then i log in right back into the level when i start it up (as from the note at the beginning of the mission). after i start up, weird graphic glitches are everywhere. letters missing from text, chat bubble gets static-y, weapons wheel is completely messed up, including a lot more. at first i thought it was part of the mission but it still continued after the mission was over.
im running the game through steam and usually don't have any problems.
I have the same problem.