I don't know if this helps but I had to follow these steps to get Youtube working on my new Bold:
go to m.youtube.com and scroll to bottom of page.
click "start optimization"
test 1/7: click "yes" when you see the tiny grey heart
test 2/7: click "yes" when you see the puppy
test 3/7: click "no" when the flash lite video fails
test 4/7: click "click here" when pressing "5" key does squat
test 5/7: there is no test 5 for some reason - skip to test 6/7
test 6/7: click "YES" - the mp4 test video WILL FAIL BUT CLICK "YES" ANYWAY
test 7/7: click "no" - h.263 does not work
or email yourself the link if "Optimize" does not appear at the bottom of your page.