Thanks for the detailed explanation, thegman. But I'm really not sure what's going on. I guess I'll try to install the CSSU some time this week, and see if I can reproduce it.

The app is supposed to lock its window in Landscape, and handles the portrait rotation within that window (you can turn it around upside-down, and it's much faster than the PR1.3 window rotation). So the force rotation mode in CSSU could cause some layout weirdness, but the pages shouldn't be all white, or black.