This issue still exists.
I am using Ubuntu 10.04 Lucid 64 bit on an hp touchsmart tx2 laptop with an
AMD Turion X2 64 bit processor.

I get this as well. Download crashed after 5Gb of a site was downloaded.
When I run httrack --repair-cache, I get the following:

A cache (hts-cache/) has been found in the directory 
That means that a transfer has been aborted
OK to Continue httrack httrack?
Press <Y><Enter> to confirm, <N><Enter> to abort
Y
Cache: trying to repair hts-cache/new.zip
*** buffer overflow detected ***: httrack terminated
======= Backtrace: =========
/lib/libc.so.6(__fortify_fail+0x37)[0x7fb60e74f207]
/lib/libc.so.6(+0xfe0c0)[0x7fb60e74e0c0]
/lib/libc.so.6(__fread_chk+0x15b)[0x7fb60e74e89b]
/usr/lib/libhttrack.so.2(unzRepair+0x2fb)[0x7fb60ec94c5b]
/usr/lib/libhttrack.so.2(hts_main2+0xda4d)[0x7fb60ec7280d]
httrack[0x401bf4]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7fb60e66ec4d]
httrack[0x4013e9]
======= Memory map: ========
00400000-00406000 r-xp 00000000 08:01 10592                             
/usr/bin/httrack
00605000-00606000 r--p 00005000 08:01 10592                             
/usr/bin/httrack
00606000-00607000 rw-p 00006000 08:01 10592                             
/usr/bin/httrack
008f7000-0093d000 rw-p 00000000 00:00 0                                 
[heap]
7fb60da50000-7fb60da66000 r-xp 00000000 08:01 722                       
/lib/libgcc_s.so.1
7fb60da66000-7fb60dc65000 ---p 00016000 08:01 722                       
/lib/libgcc_s.so.1
7fb60dc65000-7fb60dc66000 r--p 00015000 08:01 722                       
/lib/libgcc_s.so.1
7fb60dc66000-7fb60dc67000 rw-p 00016000 08:01 722                       
/lib/libgcc_s.so.1
7fb60dc67000-7fb60dc69000 r-xp 00000000 08:01 1971316                   
/usr/lib/libhtsjava.so.2.0.43
7fb60dc69000-7fb60de68000 ---p 00002000 08:01 1971316                   
/usr/lib/libhtsjava.so.2.0.43
7fb60de68000-7fb60de69000 r--p 00001000 08:01 1971316                   
/usr/lib/libhtsjava.so.2.0.43
7fb60de69000-7fb60de6a000 rw-p 00002000 08:01 1971316                   
/usr/lib/libhtsjava.so.2.0.43
7fb60de6a000-7fb60dfd2000 r-xp 00000000 08:01 1591                      
/lib/libcrypto.so.0.9.8
7fb60dfd2000-7fb60e1d1000 ---p 00168000 08:01 1591                      
/lib/libcrypto.so.0.9.8
7fb60e1d1000-7fb60e1de000 r--p 00167000 08:01 1591                      
/lib/libcrypto.so.0.9.8
7fb60e1de000-7fb60e1f6000 rw-p 00174000 08:01 1591                      
/lib/libcrypto.so.0.9.8
7fb60e1f6000-7fb60e1fa000 rw-p 00000000 00:00 0 
7fb60e1fa000-7fb60e245000 r-xp 00000000 08:01 10517                     
/lib/libssl.so.0.9.8
7fb60e245000-7fb60e444000 ---p 0004b000 08:01 10517                     
/lib/libssl.so.0.9.8
7fb60e444000-7fb60e446000 r--p 0004a000 08:01 10517                     
/lib/libssl.so.0.9.8
7fb60e446000-7fb60e44b000 rw-p 0004c000 08:01 10517                     
/lib/libssl.so.0.9.8
7fb60e44b000-7fb60e44c000 rw-p 00000000 00:00 0 
7fb60e44c000-7fb60e44e000 r-xp 00000000 08:01 4742                      
/lib/libdl-2.11.1.so
7fb60e44e000-7fb60e64e000 ---p 00002000 08:01 4742                      
/lib/libdl-2.11.1.so
7fb60e64e000-7fb60e64f000 r--p 00002000 08:01 4742                      
/lib/libdl-2.11.1.so
7fb60e64f000-7fb60e650000 rw-p 00003000 08:01 4742                      
/lib/libdl-2.11.1.so
7fb60e650000-7fb60e7ca000 r-xp 00000000 08:01 4739                      
/lib/libc-2.11.1.so
7fb60e7ca000-7fb60e9c9000 ---p 0017a000 08:01 4739                      
/lib/libc-2.11.1.so
7fb60e9c9000-7fb60e9cd000 r--p 00179000 08:01 4739                      
/lib/libc-2.11.1.so
7fb60e9cd000-7fb60e9ce000 rw-p 0017d000 08:01 4739                      
/lib/libc-2.11.1.so
7fb60e9ce000-7fb60e9d3000 rw-p 00000000 00:00 0 
7fb60e9d3000-7fb60e9e9000 r-xp 00000000 08:01 537                       
/lib/libz.so.1.2.3.3
7fb60e9e9000-7fb60ebe8000 ---p 00016000 08:01 537                       
/lib/libz.so.1.2.3.3
7fb60ebe8000-7fb60ebe9000 r--p 00015000 08:01 537                       
/lib/libz.so.1.2.3.3
7fb60ebe9000-7fb60ebea000 rw-p 00016000 08:01 537                       
/lib/libz.so.1.2.3.3
7fb60ebea000-7fb60ecbe000 r-xp 00000000 08:01 1971314                   
/usr/lib/libhttrack.so.2.0.43
7fb60ecbe000-7fb60eebd000 ---p 000d4000 08:01 1971314                   
/usr/lib/libhttrack.so.2.0.43
7fb60eebd000-7fb60eebe000 r--p 000d3000 08:01 1971314                   
/usr/lib/libhttrack.so.2.0.43
7fb60eebe000-7fb60eec2000 rw-p 000d4000 08:01 1971314                   
/usr/lib/libhttrack.so.2.0.43
7fb60eec2000-7fb60eeda000 r-xp 00000000 08:01 4753                      
/lib/libpthread-2.11.1.so
7fb60eeda000-7fb60f0d9000 ---p 00018000 08:01 4753                      
/lib/libpthread-2.11.1.so
7fb60f0d9000-7fb60f0da000 r--p 00017000 08:01 4753                      
/lib/libpthread-2.11.1.so
7fb60f0da000-7fb60f0db000 rw-p 00018000 08:01 4753                      
/lib/libpthread-2.11.1.so
7fb60f0db000-7fb60f0df000 rw-p 00000000 00:00 0 
7fb60f0df000-7fb60f0ff000 r-xp 00000000 08:01 2197                      
/lib/ld-2.11.1.so
7fb60f2ba000-7fb60f2e1000 rw-p 00000000 00:00 0 
7fb60f2f8000-7fb60f2ff000 rw-p 00000000 00:00 0 
7fb60f2ff000-7fb60f300000 r--p 00020000 08:01 2197                      
/lib/ld-2.11.1.so
7fb60f300000-7fb60f301000 rw-p 00021000 08:01 2197                      
/lib/ld-2.11.1.so
7fb60f301000-7fb60f302000 rw-p 00000000 00:00 0 
7fff0c368000-7fff0c37d000 rw-p 00000000 00:00 0                         
[stack]
7fff0c3fa000-7fff0c3fb000 r-xp 00000000 00:00 0                         
[vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                 
[vsyscall]
Aborted