The blackscreen on my n900 was a result of qtquick namespace incompatibility

to users:
quick fix is to install "qtquick 1.0 compatibility plugin"

to dev:
quick fix: make cutetube-qml dependant on "qtquick 1.0 compatibility plugin"
real fix: fix namespaces for things you import

p.s i couldn't update for a few days beucause the update conflicts with the cutetube-qml-widget (and also replaces xtube), you could repackage cutetube-qml to conflict the offending packages so the update works more smoothly.

p.p.s I have no idea about packaging are qt namespaces so what I have said is obviously harder to do than to post on a forum

p.p.p.s Thanks for the great app lots of love RP