I just upgraded my AT&T Lumia 920 to WP8.1 and Lumia Cyan, and everything seemed fine except for just one thing. My OneDrive app doesn't work any more. I can't open it from my app list; when I touch it to open, it registers my touch, but doesn't do anything. When I do a press and hold, the only thing that pops up in the menu is "Pin to start" so I can't uninstall it. When I pin to start, it's "grayed-out", and I can't click it. When I go to the app's page in the store, the usual "View" and "Share" buttons on the bottom panel is gone, the entire bottom-panel is blank. What is wrong? Integration still works, I can still upload to OneDrive from other apps, Photos, etc. But I can't open the app itself, or do anything else with it either, actually.