HTML5 video player won't load YouTube videos (and probably nothing else either)

When I request that YouTube use the HTML5 video player for videos, no videos will load - I have to switch to Adobe Flash for anything to play. The page for a video will finish loading and I'll just sit there watching the loading spiral of death ceaselessly. I've tried a number of suggestions from other threads with similar issues and nothing's helped.
- Safe Mode does NOT fix the problem (so it's not an add-on or script issue)
- Clearing cookies/cache does not work
- Toggling the media.windows-media-foundation.enabled setting does nothing
- Disabling hardware acceleration also does nothing
I'm at my wit's end. Flash will hang and crash REALLY often so I don't want to use it, but it's the only thing that works for YouTube. Please help.

You have to download and install Adobe Flash. Flash is not pre-installed.
http://get.adobe.com/flashplayer/

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