MuseScore 3 updated, now does not work

I updated MuseScore 3 with the latest update it sent me. Now, when I open MuseScore, it gives me the Start Center pop-up and when I click Create New Score or Close, it won't let me click on anything else (if I open a score, it works). It gives me an alarm like there is a pop-up window is still open somewhere, but it's not showing one.