I'm trying to use PowerPoint on my Mac with Mountain Lion. I have a window that was originally opened in Desktop 1 and then I moved it to Desktop 4. Now, whenever I try to focus on the window in Desktop 4, it auto-switches back to Desktop 1, preventing me from actually doing anything in PowerPoint. The key here seems to be that I've turned off the System Preference in the Mission Control tab to switch to a tab with an open window when I switch to an application. When I check that box, everything works as expected. That's a horrible solution though. Has anyone figured out a better way?