Transport display problems

Hi out there,

I upgraded a Nuendo 6 trail version to 6.0.7 and since then the transport display, the cursor and some other funny disfunctions happen. When I open a project the transportfunction works as regular, but after I changed anything like adding a track or executing an edit or what ever the transport buttons do not work the way they should, the tc display freezes during playback as the cursor does and updates only when the playback is stopped. The audio and video is playedback properly. There are some more funny changes which all belong only to display functions. All changes are executed, but not properly displayed.
Anyone familiar whith that?
And where do I get a previous sw version like 6.0.6 from. On the Steinberg website no previous versions are available.