Bus error

Hello,

When doing different tasks (opening gthumb, tryng to access system parameters, loading some websites) I have a "bus error" in the terminal and the program closes or doesn't open.

I have tried different things on the french forum

http://trisquel.info/fr/forum/plantages-%C3%A0-r%C3%A9p%C3%A9tition-des-navigateurs

but we couldn't find the origin of the bug, and I don't understand the wikipedia page about bus errors. I have tried different browsers and workspaces but I still have the same problem. I have the same problem using linux-libre 3.13 and 3.19.