I suffer the same bug with similar system (Debian SID linux kernel 2.6.32-5-686, pcmanfm 0.9.7-1 , libfm0 0.1.14-2 libfm-gtk0 libfm0 0.1.14-2 , libc6 2.11.2-7).
Pcmanfm crash instantly after right click on mouse over a file or directory, not if the right click is made over the background of the directory. e.g.: It doesn't crash on right clicking on the desktop background. I founded also a curious issue: it doesn't crash making right click on trash:/// files nor menu://applications/ files. dmesg says after crash: pcmanfm[7088]: segfault at 1 ip b6e24e38 sp bfa5516c error 4 in libc-2.11.2.so[b6db2000+140000] In one of the crashes it said a similar message, but instead libc it complained about libfm-gtk0, but I didn't remember how I made this crash to reproduce the dmesg message. Reported also on the lxde.org forum. Thanks.