What is happening is that the tool palette is getting duplicates of the tools. It isn’t locked up, but gets very slow.
A work around for now is to go into landscape, and move this palette into the second row:
You can do that in portrait as well, but make sure to do it before you have orbited at all. Either way, when you’re back in portrait the performance should be good.
I don’t know when the problem is going to be fixed.