Looks like one of the GPU assignment servers (AS) is having some issues (Official forum thread). Since its gone down over a weekend (as usual ...), could be a while for the issue to be fixed as the Yanks also have a 'bank' holiday this weekend - it's Memorial Day on Monday.
I was just wondering why I could hear myself and the temperature had dropped in my room! I have 2x970's and no wu's. Seems one of the cards has been idle for a few days while I have been away. Oh well, that should ease the electricity bill this month! I'll try a reboot etc.