Please include the flowing when reporting a bug:
- MAC OS
- 13.2.1
- 2.19.4
- scrolling font
- If possible, attac
h a screenshot
Hello @DAVIDOFF, thank you for your post and welcome to the forum 
We did receive other reports about this bug, one of them discussed here: Error "Something bad happened TypeErro: j is not a function" - #8 by gtkx
As we’ve mentioned there, the next update will fix this since we’ve already managed to figure out what the reason was.
Thank you again,
Yuriy
FontBase Dev Team