Sorry I had to be more specific, so that said it crashes after I hit the little camera button (create a thumbnail). It doesn’t go further. If there is any dump file that might help you to help me don’t hesitate to ask.
In advance thanks for helping
UPDATE
Since you haven’t answered yet, I’d like to update that I’ve just updated UE to 4.5 and I installed the version coming with that version. At the moment I’m not dealing with that error anymore.