Since the upgrade to Mountain Lion, I have problems dragging Apps into the Applications folder. I have turned off Gatekeeper by changing the settings to allow any source for the apps. I can indeed run the apps form DMGs, but if I try dragging them into Applications I get "The operation can't be completed, because you don't have permission to access some of the items". Interestingly, I have no problem to drag a regular file, like PowerPoint presentation, into Applications. any ideas?