I am a long-time subscriber to the full Creative Cloud. Recently Acrobat DC asks me to sign in every time I open a PDF (when it is not already running) even though I am signed in to my Creative Cloud account and using one or more applications.

After I sign in successfully, in the upper right corner it still says, "Sign In."

I've tried all the troubleshooting steps on the support page. Nothing works.

This is very annoying to say the least.