Flash uses local storage for caching and things alike just as your browser does but on it's own. Check google on how to clean Flash's cash for your platform. Most likely that'll do the trick. Besides that do clear your browser cache if you didn't do that yet!
Installing Flash on top of what you already got most likely won't help. Use Flash uninstaller utilities to get rid of likely corrupted settings. Google uninstall flash yourOS
you're welcome