Hi there! Sorry for the delay, I've been traveling a bit.
Well, Windows forced an update on me, and then Intel pushed a beta driver update, and I can't reproduce the error. It is sort of the same, but without the corruption. If I switch to portrait mode, DeskScape doesn't recognize the new screen height, and I have a bar underneath, but it is just empty, no corruption. Switching back to landscape mode, and I no longer have a corrupted screen either.
I'm going to be a bit busy over the Christmas period, but I'll try a driver rollback to see if I can reproduce the problem with old drivers.