Version 5.1 with Black Magic Decklink

I tried upgrading to 5.1. Since then, my Black Magic video display does strange things with certain video files. With one (H264) it seems to zoom in (so the edges disappear). Others are jerky and some play normally. I rolled back to 5.01 and all is fine again.
I’m running Nuendo 5 32 bit on windows 7(64) and XP(32). Behaviour is same under both OS’s.

We had to roll back to 4.3
Now our 5 boxes of NU5 are waiting for the next update

The next maintenance release will solve the issue.