>   Been using WinHTTrack on WinXP for a while now, and 
never
> had problems.  Then today I mirror a site just fine, exit,
> then start up the program again to mirror another site, 
and
> everything hangs.

Darn, I really don't have any idea! Did you passed 
all "Service packs" ? Any web-accelerator things installed 
on the system ?