I've done this about 5 times now.  Every time it tells me there is a screen size problem, I enter the screen size, then the dots of the calibration process arent there - just a white screen.  I have to exit, sign out and sign in again.

how do you get this bloody thing to work?

In contrary, it works charmingly here. In your case it doesn't, probably because the monitor sits upside down ... stupid joke, indeed ... Seriously, try different computer monitor, the issue was reported.

Gherk, please try to adjust the screen resolution to see whether it works. If still not, please try to change another PC and check again.