I found out what was causing the crashing for me. In my default.map file I was missing a few lines. Here is what I currently have in mine. Copy and paste this into yours and see if it fixes your problem.
It's great that you squashed that annoying bug!
Sad thing is that my default.map does already look exactly the same (I pasted your text instead for what there was before and git registered no line changing). What lines did you change? Probably there is a problem in one of the files where these lines link.