I don't usually leave things open so I had not seen that problem before. So I just tried opening loads of things on the Pro1 and I couldn't get it to misbehave at all in a few minutes of testing. Up to 12 tiles they all rotate and reorganise when I rotate the phone. With 13 they don't fit on the screen anymore and I have to swipe to see them all, but they still rotate and reorganise as expected.

My rotation is locked to only portrait and landscape, not all four directions, I don't have any patches installed with patchmanager though.

I will leave a few things open and keep an eye on them