Try reinstalling Adobe Flash by doing the following:
1) Download and run the 'Official Adobe Flash Uninstaller'
2) (Optional) Open Windows Explorer and delete the following folders:
**If you can't find/locate the folders, then skip this step.
3) Reinstall the latest Adobe Flash Player:
For Internet Explorer - http://fpdownload.macromedia.com/pub/flashplayer/current/licensing/win/install_flash_player_11_active_x_64bit.exe
For Waterfox and other browsers - http://fpdownload.macromedia.com/pub/flashplayer/current/licensing/win/install_flash_player_11_plugin_64bit.exe
**You can install both. That's what I do.
4) You're done! Using these steps will properly remove Adobe Flash and reinstall a fresh copy. Hopefully this will fix any issues you have with flash content.