Flash content blank and unable to access flash control panel to turn off hardware acceleration.

Flash content appears as blank and nothing happens when attempting to access flash player settings. Not sure if it helps, but the operating system is Mac OS X Mavericks running in virutal machine.
* QuickTime
* Shockwave Flash 14.0 r0
* Displays Java applet content, or a placeholder if Java is not installed.

Hi 薛定谔的老猫,
On your [about:addons] page, please select "Always Activate" for the Flash player.
*If it is crashing: [[Send plugin crash reports to help Mozilla improve Firefox]]
*Please also try to reload the page after you change this setting.
* Also try to reinstall Flash.
Please post back with your results, it can help other users.

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