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Hello,
I have recently had an OS and security update on my Mac AirBook 13 and then the problems started. TVPaint worked flawlessly and I had no issues but after that update, the software starts but then it is just a logo and nothing else. I tried restarting the computer, of course, even reinstalling my app but to no avail. I wanted to reverse the update too but, to be honest, I don't know how to do it. I am not an avid Mac user and before that used to be a PC person. Did that happen to anyone else?

Check your OS version. ("About this Mac")

What's your licencing ? do you have a dongle or not ?

Then yes, tell us your MacOS version.

You may also try to get rid of the tvp* folder in the Library subfolder that's in your home directory (how'd you say it in a mac-user friendly language ? the unix way woud be : rm -rf ~/Library/tvp*)