I may or may not be experiencing the same thing. I wasn't around when this crash happened, but when I flipped on my monitor today (after an evening of download a thing or two), I was presented with the following console output:

*************************************************************
Catching SIGSEGV, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
stack trace:
*** glibc detected *** /usr/bin/qbittorrent: malloc(): memory corruption: 0x00007ffa200393b1 ***
======= Backtrace: =========
/lib/libc.so.6[0x7ffa3947efef]
/lib/libc.so.6(__libc_malloc+0x98)[0x7ffa39480828]
/lib/libc.so.6(__backtrace_symbols+0x10f)[0x7ffa394ff81f]
/usr/bin/qbittorrent[0x472f58]
/usr/bin/qbittorrent(_Z14sigsegvHandleri+0x3d)[0x47344d]
/lib/libc.so.6[0x7ffa39437040]
/usr/lib/libstdc++.so.6(__dynamic_cast+0x7a)[0x7ffa39cd921a]
/usr/lib/libtorrent-rasterbar.so.2[0x7ffa3bbb4bf2]
/usr/lib/libtorrent-rasterbar.so.2(_ZN10libtorrent7torrent14on_name_lookupERKN5boost6system10error_codeENS1_4asio2ip23basic_resolver_iteratorINS7_3tcpEEESsNS7_14basic_endpointIS9_EE+0x7a2)[0x7ffa3bb3c932]
/usr/lib/libtorrent-rasterbar.so.2(_ZN5boost4asio6detail13handler_queue15handler_wrapperINS1_7binder2INS_3_bi6bind_tIvNS_4_mfi3mf4IvN10libtorrent7torrentERKNS_6system10error_codeENS0_2ip23basic_resolver_iteratorINSF_3tcpEEESsNSF_14basic_endpointISH_EEEENS5_5list5INS5_5valueINS_10shared_ptrISA_EEEENS_3argILi1EEENSR_ILi2EEENSN_ISsEENSN_ISK_EEEEEESC_SI_EEE7do_callEPNS2_7handlerE+0x4a8)[0x7ffa3bb567f8]
/usr/lib/libtorrent-rasterbar.so.2(_ZN5boost4asio6detail15task_io_serviceINS1_13epoll_reactorILb0EEEE3runERNS_6system10error_codeE+0x37e)[0x7ffa3babfffe]
/usr/lib/libtorrent-rasterbar.so.2(_ZN10libtorrent3aux12session_implclEv+0x79)[0x7ffa3bb00339]
/usr/lib/libboost_thread-mt.so.1.37.0(thread_proxy+0x5f)[0x7ffa38de3f6f]
/lib/libpthread.so.0[0x7ffa3b51e3ba]
/lib/libc.so.6(clone+0x6d)[0x7ffa394e9fcd]
======= Memory map: ========
00400000-0070a000 r-xp 00000000 08:01 1671265                            /usr/bin/qbittorrent
00909000-0090a000 r--p 00309000 08:01 1671265                            /usr/bin/qbittorrent
0090a000-0090d000 rw-p 0030a000 08:01 1671265                            /usr/bin/qbittorrent
0090d000-0090f000 rw-p 0090d000 00:00 0 
028c3000-0356a000 rw-p 028c3000 00:00 0                                  [heap]
7ffa20000000-7ffa204fb000 rw-p 7ffa20000000 00:00 0 
7ffa204fb000-7ffa24000000 ---p 7ffa204fb000 00:00 0 
7ffa24cfd000-7ffa254fe000 rw-p 7ffa24cfd000 00:00 0 
7ffa25c01000-7ffa25c03000 r-xp 00000000 08:01 6455386                    /lib/libnss_mdns4.so.2
7ffa25c03000-7ffa25e03000 ---p 00002000 08:01 6455386                    /lib/libnss_mdns4.so.2
7ffa25e03000-7ffa25e04000 rw-p 00002000 08:01 6455386                    /lib/libnss_mdns4.so.2
7ffa25e04000-7ffa25e64000 rw-s 00000000 00:09 60719164                   /SYSV00000000 (deleted)
7ffa25e64000-7ffa25e65000 ---p 7ffa25e64000 00:00 0 
7ffa25e65000-7ffa26665000 rw-p 7ffa25e65000 00:00 0 
7ffa26665000-7ffa26666000 ---p 7ffa26665000 00:00 0 
7ffa26666000-7ffa26e66000 rw-p 7ffa26666000 00:00 0 
7ffa26e66000-7ffa26e67000 ---p 7ffa26e66000 00:00 0 
7ffa26e67000-7ffa27667000 rw-p 7ffa26e67000 00:00 0 
7ffa27667000-7ffa27668000 ---p 7ffa27667000 00:00 0 
7ffa27668000-7ffa27e68000 rw-p 7ffa27668000 00:00 0 
7ffa27e68000-7ffa27e6d000 r-xp 00000000 08:01 6455379                    /lib/libnss_dns-2.9.so
7ffa27e6d000-7ffa2806c000 ---p 00005000 08:01 6455379                    /lib/libnss_dns-2.9.so
7ffa2806c000-7ffa2806d000 r--p 00004000 08:01 6455379                    /lib/libnss_dns-2.9.so
7ffa2806d000-7ffa2806e000 rw-p 00005000 08:01 6455379                    /lib/libnss_dns-2.9.so
7ffa2806e000-7ffa28070000 r-xp 00000000 08:01 6455387                    /lib/libnss_mdns4_minimal.so.2
7ffa28070000-7ffa2826f000 ---p 00002000 08:01 6455387                    /lib/libnss_mdns4_minimal.so.2
7ffa2826f000-7ffa28270000 rw-p 00001000 08:01 6455387                    /lib/libnss_mdns4_minimal.so.2
7ffa28270000-7ffa28271000 ---p 7ffa28270000 00:00 0 
7ffa28271000-7ffa28a71000 rw-p 7ffa28271000 00:00 0 
7ffa28a71000-7ffa28a72000 ---p 7ffa28a71000 00:00 0 
7ffa28a72000-7ffa29272000 rw-p 7ffa28a72000 00:00 0 
7ffa29272000-7ffa292fe000 r--p 00000000 08:01 6350789                    /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf
7ffa292fe000-7ffa292ff000 ---p 7ffa292fe000 00:00 0 
7ffa292ff000-7ffa29aff000 rw-p 7ffa292ff000 00:

Ubuntu 9.04/64-bit (Linux 2.6.28-13-generic (x86_64))
AMD Sempron(tm) Processor 3100+
2035MB (1096MB used)

Aaron