I wonder if there was a limit on the length of an Academic license or some sort of renewal process you have to follow.
What school, specifically? There were a few schools that deactivated all their users a few weeks ago so they wouldn’t have to keep paying Adobe for the products, which does make sense from the school’s point of view if the people have graduated, at least.
They have since activated the products individually for some people, but will permanently disable them Dec 2015. I don’t know if you’re in this situation or something else is going on.
You may get a reply from an Adobe rep that can tell you more…I’m just another user and have never owned an educational license, but if not you might want to start a chat session. Is this CS6?