PRO version not working

I purchased the Pro version because I wanted to have the schedule function. VERY stupid of course, I should have tested the FREE version first! Installed the pro version, connected Dropbox, and nothing happens. Dropbox is authorized, the UID is shown. Clicking create backup just launches a Please wait… 99 sec. screen which counts forever. I waited 20 minutes and no backup. I tried adding an API key but each time i enter the key and click save it disappears again. Plugin is useless for me. I will request a refund through Paypal if I don’t get a solution within the next couple days.