After latest CC update, Acrobat DC keeps asking me to buy or activate

Acrobat DC is part of my CC package, but after this most recent CC update (5.1.0.407), every time I use Adobe Acrobat DC, it asks me to purchase it or activate it in order to use features. If I just close the pop-up, I can continue like normal with all features, but clearly there is an issue that at least for a moment, it doesn't recognize either my license number or that it is already activated in my account. Doesn't keep me from getting work done, but it is unnecessary and annoying.