Safari 5.1 won't play video on YouTube

I did all of the latest Apple upgrades last night and now Safari 5.1 will not play video on YouTube (get message that a plug-in is missing - it doesn't specify which plug-in). Have the same problem with video on www.Telegraph.co.uk. So, is Apple picking a fight with some commom video format or is this just a bug (and we're the beta test site)?

@unclepete THANK YOU!! I tried uninstalling 5.1, back to 5.0.5 only to have the same issues. Then back to 5.1 and the issues got even worse, this is after making sure all Internet Plugin's were eliminated and newest flash plugs installed. I was at the end of my rope! Not only was I having problems with Safari not playing videos on YouTube (only would play audio) and other video sites, but some of my pro applications started getting weird on me, saying I had no VRAM (thats a whole other topic!). I made sure I had applejack for SL installed, then did the "Command-S" at startup, went through all 5 steps, and POW!! When I rebooted everything worked, including 5.1 complete with YT video and audio with no weird page refresh issues!!
APPLEJACK IS THE ANSWER. Everyone needs to try that FIRST, before messing about with the plugs, installs, prefs, etc.
Model Name:                    Mac Pro
OS:                                    SL 10.6.8
Model Identifier:               MacPro3,1
Processor Name:               Quad-Core Intel Xeon
Processor Speed:               2.8 GHz
Number Of Processors:      2
Total Number Of Cores:     8
Memory:                            8 GB

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