FC17 flash plugin problem

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http://forums.fedoraforum.org – Loaded a new x32 machine with FC17 XFCE. I went through the adobe flash plugin install procedure. All that went without incident. Used all the latest updates for FC17 and flash. I try youtube, the videos seem to load but never start to play. Just a black square. Now, go to the plug in control panel DISABLE flash. Go back to the page re-load and the video plays just fine. Now exit firefox, restart and try a different video. Error "plugin required" appears. Re-enable the flash plugin, re-load, video now plays. I have the same flash & firefox configuration on my x6 (HowTos)