Welcome to TVPaint Community forums !

You can always start TVP with the default configuration (see manual), but will lose all your bins, brushes, shortcuts etc, so backup each of those before.

I've found the profile curves not exactly complex (don't use any default anyway), so it's easy to recreate one that is missing.

Here's the default config file : Find yours in %APPDATA%\tvp****, and compare the [ProfileEditor] section with the one from the attached config.

I agree that there should be a restore option. If you don't mind proposing your idea in "Features & improvement requests"