Hi Hans,
We had the same problem. IT got solved by following this checklist
http://wiki.scn.sap.com/wiki/display/Img/Pre+and+post+installation+Checklist
Our problem was that we were on SP3 of the basis component and hadn't implemented note 2007072
I reimplemented the notes following the above note just to make sure. Now we have Screen Personas 3.0 working.