thanks again to pilot "A"! I received your crash report - screenshot and all - and it was super-helpful for fixing this bug!
I was able to quickly reproduce and fix this crash, which ocurred whenever you attempted to win the game! (argh!)
it was due to the new co-op achievement code... it was a tiny addition on my part, so I didn't test it, but there was a teeny-tiny problem with it, resulting in this crash :|
well! sorry again; I'm glad I was able to get a fix together so quickly, and that's definitely in part thanks to your guys' crash reports!
p.s. it's awesome to see that people are beating the game! I rarely even make it half-way myself!