I found the saved logs for my project. This is the crash event:
[2014.05.28-06.19.34:810][222]LogWindows: Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.1\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 518]
Array index out of bounds: 0 from an array of size 0
It seems a lot like my project has become corrupt somehow. Is there an easy way to clean it up? I know I can start a new one and pull all the assets across and it would probably be good practice, but I’d also like to try recovering this one.