We are having the same or very similar problem though I don't think it's a 2012 to 2013 bug as this started around the 18th of December.
Our work uses Creative Cloud on two machines (one in the office [PC] and one at home [Mac]) but only one is in use at anyone time. Several weeks ago the Mac one is saying it is now on a trail version and has been counting down from 30 days ever since then yet it is fine on the PC. Have checked that subscription payments have gone through which they have. Also tried to re-enter the serial number but no luck.
Only 15 days left for us, we need some help Adobe!