Your System Delails shows Shockwave Flash 16.0 r0 It's not the latest, but should still be good. Flash Player '''v16.0.0.235 https://www.adobe.com/products/flashplayer/distribution3.html''' ------------------- If you have problems with current Shockwave Flash plugin versions then check this: * see if there are updates for your graphics drive drivers '''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration''' * disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) '''https://forums.adobe.com/message/4468493#TemporaryWorkaround''' * disable hardware acceleration in the Flash plugin '''https://forums.adobe.com/thread/891337''' See also: * '''http://kb.mozillazine.org/Flash#Troubleshooting'''

Updated the plugin, no luck. Graphics drivers are up to date. Disabling protected mode doesn't fix it. Cannot disable hardware acceleration, as I cannot right-click on the plugin.

Also tried resetting Firefox, running in Safe Mode and also with a fresh profile - still having an issue.