Note: Before bug reporting, please make sure you have tried the latest (alpha) version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS Console.app from the "User Diagnostic Reports" section.
This text was on the Basic settings tab, similar patterns may be in other places I didn't check.
This small font, non-bolded/outlined red text is incredibly difficult to read on this grey background.