Seriously. Stop screwing around with superficial new stuff and fix the insane amount of clumsy, idiotic glitches that plague the site.
You KNOW they're NOT going to do that until the NEXT major update/overhaul, and knowing them and how unpredictable their updates are, it can be anywhere between several months to a few years.
Lately, I've noticed they switch back and forth between the previous video player, and their new player... BOTH of which have pros and cons...
With the previous player, you're able to actually change the playback settings (360, 480, 720, etc), but it's still presently plagued with loading/buffering issues.
The new player, on the other hand, has no issues with loading the videos, nor are there any lags with jumping ahead or back in the play bar, but the new player doesn't allow you to change the playback settings, so all videos are stuck in 360 by default (though somehow, they think the playback speed options makes up for it?)