I have a non CC copy of CS6 Design STD that I've been using without issue until a couple of months ago. Occasionally when I opened it, it had reverted to a trial and required me to re-enter my serial number. It was inconvenient, but after putting the S/N in again it would work for another week or so.
That is until last week. My PC has has some major hardware issues and I've been unable to use my Adobe products. When my software opens I have two options continue the trial or licence the software. If I click licence this software I'm taken to the sign-in window and and endless loop. When I try to sign in a window briefly appears that says "Please wait a moment" and then I'm taken back to the sign in page again. It doesn't matter if I'm logged into my adobe account online or not.