Using SW2012 SP5.0. Something weird going on I haven't seen before. Played around with scenes and lighting and now I've screwed something up. I wanted to create an animation, but now whenever I enter the motion study it changes the shadow height (even though I don't care about using the shadow, and I have document scene turned off in general options). Once the shadow height changes all my standard views are about half size now, and I can't get things back as they were without shutting down and re-starting. Even if I keep shadows turned off it still affects all the standard views the same way.
Here's a before shot:
And here's after the motion study tab: