http://bugs.winehq.org/show_bug.cgi?id=12924
--- Comment #1 from Roderick Colenbrander thunderbird2k@gmx.net 2008-05-03 13:10:42 --- It crashes due to memory corruption, pbuffers aren't used at all and it tries to make a pbuffer call. A solution to the problem is to change 'This->numContexts' in for(s = 0; s < This->numContexts; s++) {' to 'This->numContexts + 1'. Someone recently had a similar issue and will submit a patch.