Welcome to Seamly @Stitchchick! Sorry your experience is starting off poorly!
I see you’re using MacOS, & I think the 2023-09-1 build of Seamly?
Perhaps there is helpful information in one of these previous topics on the subject: Seamly 2D crashes when adding formula for measurements (Mac OS Monterey), Formula assistant crashes program, Formula button error crash.
I believe @csett86 is the closest we have to a MacOS dev at present, though @Douglas or @slspencer are the leads, so their word is more meaningful.
