Youtube HTML5 fails to load in Safari 5, or 4.0.5

All I get is the spinning HTML5 whirly thing for Youtube's HTML5 videos (although Apple's demo HTML5 page loads without problem). I have no such problems in Chrome or Firefox.
I also previously had the same issue in Safari 4.0.5. With Safari 5 I have tried removing the add-on plug-ins and uninstalling and reinstalling Flash, all to no avail.
Help would be much appreciated!

HI and Welcome to Apple Discussions...
If you didn't repair disk permissions after reinstalling Flash, Adobe suggests you do that. http://kb2.adobe.com/cps/000/2dda3d81.html
Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and *restart your Mac.*
Relaunch Safari. If that didn't help, install the v10.5.8 Combo Update
Carolyn

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''guigs2 [[#answer-704713|said]]''
<blockquote>
Ah! Sorry for the misunderstanding. If you update Flash to version 17, you should not run into this anymore.
</blockquote>
how does updating flash effect HTML5? i went back to flash, cause this was more pain then memory leak caused by flash

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Step 1
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Youtube HTML5 fails to load in Safari 5, or 4.0.5

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