[NathanKP]

I have the same issue, but haven't had the time to fully investigate it yet. Other services have excellent download speed, typically about 3 megabytes per second download of say movies purchased through iTunes. But for some reason 1080p YouTube videos will never load.

The only thing that could be causing this is if:

1) YouTube's servers can't push the 1080p video out fast enough. (Very doubtful)

2) U Verse hasn't invested in a capable enough link to YouTube's servers. (Possible, but even a 240p video loads faster than a 1080p video. If it was purely a connection issue then 240p and 1080p videos should load at the same slow speed.)

3) They are purposefully throttling HD YouTube videos to ensure that more bandwidth is available for other things. (I'd say this is most likely.)

Either way some sort of unprofessional and/or shady thing is happening with U Verse and HD YouTube videos.