On Youtube, I had only tried Chromium since I already knew that I didn't want to muck with the noscript issue in Iceweasel. Chromium played the video, confirming that Adobe Flash was not involved, so there was no reason to investigate further.

Sounds like you saw the same Crackle error that I've seen, it doesn't think we have Adobe Flash installed even though the script told me that the install went well. That is what I'm seeing on the USA exclusive sites as well, and why I'm now using Linux Mint. Mint isn't perfect, but at least I can watch the videos that I want to watch with it.