Weird Blender Pop-Up!

I updated a lot of Adobe apps AND Win 8.1 today.

When I launch Blender, I now get this weird pop-up.

Anyone know why? I can just close the window, but still…

EDIT: When I open Preferences, a similar pop up appears. It can also be closed, and it is then possible to open the ‘real’ Preferences.


OK, I restarted a couple of times and the weird pop-up is gone…