Many People were Very Upset when they downloaded Flock only to See that it was Requiring them to Install Flash Player when they Tried to Look at You Tube Videos. When they Tried to download the flash player it would not Install and Give a Message that Flash was already Installed on the Computer.
Fortunately the is a Simple fix for this all you Have to Do is Open your Firefox Plugings Folder and Copy the Flash File from the Plugings then you Just Paste the Flash File into the Flock Plugins folder then you can Watch you Tube and Flash in Flock.
I do not Know what caused this but Flock are Working on it to Fix the flash Bug in flock but this way will let you Install Flash in Flock and Any other Plugins that you May wish to transfer from Firefox