Final Cut Express 3.5 HD quits unexpectedly
The problem was with the cross-dissolve transition that I was trying to render. Technically, I haven't figured out the problem, but now I know what is causing the problem. I am able to render video in other sequences and that works just fine. I haven't tried rendering a cross-dissolve transition in another sequence.

https://apple.stackexchange.com/questions/17524/final-cut-express-3-5-hd-quits-unexpectedly