Flash player popped up saying it needed an update, so I updated it and now any video I play on the laptop is really jumpy/jittery. It's just the video, the audio is fine. I've tried uninstalling and reinstalling, but I get the same problem. When uninstalled, some videos will still play (not sure why, and most pop up saying I need flash player), but the ones that do play - play fine. 2.5 GHz i5 MacBook Pro (retina 13) running OSX 10.9.2. Safari is up to date too. Any tips?