I have been using Photoshop CS6 because it worked.

I bought a key, registered it. No problems. It has worked fine for the last 8 months.

Today, randomly, it tells me my account is not validated, and that I have to register a valid key. So, I dig out the key, and it gives me this: 

I have tried to find a suitable way to directly contact Adobe to try to figure this out, but every arsing link takes me back to the same page of Billing, tutorials and community forums. Even the "Talk to a real person" link. I'm guessing they're out for the night.

Still, does anyone have any suggestions, or even explainations, as to why this is happening all of a sudden? And, hopefully, a solution.