I have re-installed my core with Alpha 810 and cannot get any resolution higher that 420p to display. I was previusly running 710 and had 1080p with UI1 running.
I have changed the video card (all Nvidia) but still get the same problem. All resolutions greater that 420p only show the top left quarter/eighth of the screen, so the countdown and continue/cancel buttons are not visible.
ps. have booted and configured an MD running at 1080p UI2 with no issues from this core.
Any help would be appreciated.