Something strange: using your last build with the boot.iso you just posted make graphics strange. When sliding from a card to another in the home screen, or when there are some movements on the screen, the refresh seems not to be sync’ed. I can see a kind of wave of refresh.
Maybe your tests will solve that.
Edit: it’s worse than what I’ve described. Graphics seem to have a lot of glitches on refresh. Static images (when updated) are fine.