Have you updated ID to 7.0.4?
InDesign CS5 7.0.4.
It's the German Version we use.
I don't think I've seen anydisproportianl scaling, but I have seen some oddsnapping behavior (or lack of snapping) with smart guides in CS5. You might consider turning them off.
You might consider turning them off.
This is the first thing we did today…
I will try to post some screenshots of this odd behaviour.