After installing studio 14 ultimate on my new windows8,1 desktop some transitions don't work anymore. I have a AMD Radeon(TM) R9 270 video chart.

Any suggesations to improve?

This is caused by some incompatibility between the old and current version of the videodriver, see: http://forums.pinnaclesys.com/forums/thread/622274.aspx

Going back to an old version of the videodriver may introduce instabilities in Windows....