Several fixes were merged in the 3.21-2, and logging in 
case of crashes (several crashes were reported)

Please update if you are using the 3.21 release to the 3.21-
2:
<http://www.httrack.com/index.php?p=2>

If you experience a crash/sudden stop with 
httrack/winhttrack, a CRASH.TXT files should be generated 
in the "Program Files\WinHTTrack" directory (or, in the "My 
Projects\YourProject" directory).
In this case, please mail me this file (CRASH.TXT), to 
roche@httrack.com, with URLs which caused the problem, and 
I'll be able to fix the bug.

Thanks you!