Bates stamping problems - Invalid numeric value + no font

I am having two separate issues with Bates stamping:

1. Since I got the subscription model of Acrobat Pro for Mac, I get a warning pop up every time I try to input a 6-digit Bates number: "Invalid numeric value". If I scroll up through some numbers, then delete them, I can input the numbers directly. I have had this issue for years, and tech support could not help. The workaround was fine though - lived with it.

2. Now I have an issue that means I can't use the app to Bates stamp. My saved settings have a font in them. For just over two weeks, I cannot access any fonts at all - only Symbol. The drop down menu only has "Symbol" available. So instead of the prefix I have to add for work in Arial, I get what looks like Greek lettering. Three tech support workers have accessed my computer and cleaned, uninstalled, reinstalled, etc. The problem persists and they asked me to post about it here to see if someone can find a fix.

Thanks.