I’ve noticed a strange behavior of List Filter. I created a new list filter with a name A-Z and it is inactive and displaced. http://jarocinski.com/filter.png
I cannot delete it. Newly created filters are also inactive - they can’t be selected.
I suppose it is because of a hyphen in a name of a filter…
Seems like your right. Using the name ‘A-Z’ causes that behavior.
Quick fix: Open CustomFilter.plist in ~/Library/Application Support/Glyphs/ with a text editor. Look for ‘A-Z’ and replace it by ‘AtoZ’. Save the file, restart Glyphs.