3.21 also crashes on me, though I get no error message.  
I'm only trying to mirror one site, albeit there's an 
enormous amount of files that it has to download, well over 
65,000 and I'm not sure if HTTrack can handle it (i'm 
hoping it can).  Anyways, mine usually crashes without 
warning, and as I said no error message.

I am running Windows XP w/SP1