YouTube won't play after 10.10.1 update!

After updating my iMac to OS X Yosemite 10.10.1 I now have an issue with playing videos on YouTube. Nothing will play, I either get a blank black screen or a fuzzy screen and an error message from YouTube saying 'Playback Error.
These issue only occurred after updating my OS to 10.10.1 - My version of Safari is 8.0
Anybody else experience this problem?

Actually this just started yesterday. Some of us who updated to 10.10.1 when it was first released were not having any issues until yesterday and today. So it’s something at Google’s end that has changed (Google owns YouTube). It also appears to be related to HTML5 video and not Flash. As a temporary workaround you can change Safari’s user agent from 8.0 to 7.1 and things start working again. You do this by Safari->Preferences->Advanced->check “Show Develop menu in menu bar.” Now drop down the Develop menu and select User Agent -> Safari 7.1. However, this is only temporary and the user agent will revert back to Safari 8 when you leave YouTube. Another solution is to use the Firefox or Chrome browser to visit YouTube until Apple and Google get this sorted out.

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YouTube won't play after 10.10.1 update!

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