Kurniawan thank you very much for this - working perfectly...don't know what you did but Youtube cab now absolutely spot on.
I've read elsewhere about how the 'non m.Google' Youtube app can cause freezing and lockups, as well as disabling video playback through the Sense video player but this one is not showing any signs of these...perfect for me. Standard T Mobile Rom, no upgrades.
Thanks again Kurniawan, you rock!
VI
My pleasure!