I've run into problem with httrack crashing for various
requests in my batch download, here is an example:
httrack.exe -w -r2 --ext-depth=0 -m1000000
--extended-parsing=Y --updatehack --urlhack -C0 -q -Q --near
www.shgresources.com/movies/reviews/o/onehourphoto/ +*/*.jpg

I've build libhttrack.dll from provided sources and debuged
httrack with purify. The abend is caused by call to assert
after getting NULL from localtime on stat for
rcm-images.amazon.com/images/G/01/associates/add-to-cart.gif
call stack:
_assert(void * 0x1054907c `string', void * 0x10561dc8
`string', unsigned int 2646) line 256 + 12 bytes
time_rfc822(char * 0x000d0064, tm * 0x00000000) line 2646 +
107 bytes
get_filetime_rfc822(char * 0x034f6a5c, char * 0x000d0064)
line 2636 + 43 bytes
back_add(lien_back * 0x03740050, int 1152, httrackp *
0x00127878, cache_back * 0x000e1af0, char * 0x034f6a14, char
* 0x034f6a30, char * 0x034f6a5c, char * 0x034f4938, char *
0x034f4954, int 0, int * 0x034f69dc) line 965 + 46 bytes
back_fill(lien_back * 0x03740050, int 1152, httrackp *
0x00127878, cache_back * 0x000e1af0, lien_url * *
0x03540078, int 4, int 0, int 46) line 2850 + 438 bytes
back_fillmax(lien_back * 0x03740050, int 1152, httrackp *
0x00127878, cache_back * 0x000e1af0, lien_url * *
0x03540078, int 4, int 0, int 46) line 2777 + 139 bytes
hts_mirror_wait_for_next_file(htsmoduleStruct * 0x000de4c0,
htsmoduleStructExtended * 0x000de448) line 3816 + 139 bytes
httpmirror(char * 0x03440078, httrackp * 0x0013c118) line
1035 + 49 bytes
hts_main(int 14, char * * 0x025cbfa0) line 2304 + 46 bytes

PS: despite the above problem, I love Httrack, been using it
for awhile, now.