Multiple versions of the same plugins can sometimes cause issues, please check you plugins page from about:addons to make sure that there are no duplicates. Flash player may play into that display. Uploader also uses Java, are all your plugins up to date? [[Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems]]

Shockwave Flash 15.0 r0 Shockwave Flash 13.0 r0 Flash is notorious for not cleaning out the older version as part of an update. Grab the uninstaller from here: '''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows]''' '''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac]''' Then reinstall the latest version. Update your Shockwave Flash '''v15.0.0.152 http://get.adobe.com/shockwave/'''