I have just upgraded from 2.4.1 to avenue - i have a duo 1.86 x1400 2 gb ram - 3 yr old workhorse

I installed new codec etc,, my output from 2.41 is fine but now from avenue straight to my lcd tv and via my triplehead2go output is only the bottom third of the clip on the top third of the output.
In demo clips it "blow effects" down as its trying to scale - my prerecordered 2.41 clips only play in the top third with no blow downeffect - (can recreate the effect with zooming) now slight glitches randomly with my laptop screen as well - odd''''''
The monitor output workspace view is fine too.
Need to sort it for gig this weekend or im dropping to a single screen running 2.41
cheers