BitComet crashes when doing some automatic hash checks and some manual hash checks

I’m experiencing some hash check caused crashes in bitcomet for a while now. I use version 1.33 x86. My os is windows 7 ultimate x64 sp1. Most torrents work fine, but some large ones cause crashes when hash checking.

What is the piece size of the tasks that wont hash check?

Is there a particular reason why you are using the x86 version on a 64-bit OS?