Hittade problemet äntligen!!!:
Det är stuffit 11.02 som ställer till det, jag hade avinstallerat programmet men det fanns en fil kvar:
188958 01/08, 11:03am, EST Stuffit Crashes Finder
I have verified that the latest Stuffit Deluxe 11.0.2 update crashes the Finder everytime you right-click (or control-click) on any item in the Finder. The Finder crashes but relaunches itself just fine. After narrowing it down to the StuffitCMM.plugin that resides in /Library/Contextual Menu Items folder, I uninstalled Stuffit Deluxe 11.0.2, repaired permissions, and then rebooted my Mac Pro. I can now right-click all day long without the Finder crashing. I have emailed the problem to Allume, but haven't received a reply.
När jag tog bort den filen, startade om datorn så verkar problemet ha försvunnit. Hoppas det hjälper andra som har problem med finder.
Andra länkar:
http://www.macnn.com/articles/07/01/05/stuffit.deluxe.yummysoup/
http://forums.macosxhints.com/showthread.php?p=348586
http://www.versiontracker.com/php/feedback/article.php?story=20070105004936599
Så använd version 11.01 istället.
God natt!