Ah it was happening for some users due to a software update at my web-hoster. Should be working again now!
Confirmed, thanks for the quick reply.
@Andreas_Hegenberg THANK YOU for your extremely prompt fix! I have not had any issues with the app not starting since this install, but in case it's related, I had a (never-before seen) issue where content was disappearing from my clipboard after copy/cut. It stopped as soon as I installed your update. This is very different from the issue I originally posted and I hope it's never going to happen again.
I want to shout it from a mountaintop - your software is in the top three reasons I continue to use (and enjoy) a Mac. Thank you for making it.
Thank you! I recommend to use the BTT clipboard manager, then you'll never loose clipboard content again 
(just assign the predefined action "Show Clipboard /Pasteboard History" to some trigger)
I also had this clipboard issue yesterday. When I tried to paste, there was nothing to paste. I hadn't made the connection to BTT.
Confirmed fixed for me (regular updates). Thanks Andreas!