+1 unable to logon using miner1. Looks like we're stuck in some Ubuntu logon loop. I've tired deleting .Xauthority with no luck 
I don't have much experience with rxOC, but your problem usually comes from a broken display driver.
Try to run this command from ssh or terminal (Ctrl - Alt - f1) then reboot
Code:
sudo dpkg --configure -a
Hope it helps