This may sound oversimplified, but IMHO I think this is YT's brilliant sledge-hammer way of stopping "scammers," or anybody they even think might be a scammer. They cure the disease by killing the patient. Also, they just don't seem to want people making too much money from their vidz as of late. I've done a few rants on this. I also had 40 accounts that were working perfectly pre 2012. Enter 2012 and suddenly they've all become worthless ... cant even sign in to them.
So yeah, YT is becoming a pretty crappy place to be.