I downloaded the Feb 20th developer's DM8000 Image.
I manually installed the YouTube plugin.
At first it did not load videos and it would crash (enigma restart) upon exit, I tried it a few times, similar behavior every time.
I went to the YouTube plugin options and enabled merge on download. It downloaded all the dependencies.
It now loads and plays all videos at good resolutions with perfectly synchronized sound.
Hopefully this can make it in the stable version.
Thank you for the work you put in.