Title says it all. When i choose system > quit in the menus, the comp will freeze for roughly 30 seconds, and the dialog pops up. It only happens once, and all subsequent quit-dialogs pops up immediately.
This is obviously quite irritating, and if anyone else have had the problem, please post so here, even if you don't have a solution.
tl;dr: quit dialog makes the comp freeze, solution appreciated.
Fairly hi-spec computer too, so it isn't because of the lack of resources.