I just recently started having issues with embedded YouTube videos on the mobile forums view. They show up in black and white with bad artifacting and play for a few seconds before bringing up an error. Videos work fine in the YouTube app and also from the forums when viewed on my PC.
Samsung Galaxy S4
Android 4.4.2
Chrome v37
Posts
I find it handles Flash and embedded video much better (so long as you get and activate the jetpack add-on).