I get this message when I try to open an .otf to edit it – the font works correctly in Font Explorer in all Adobe apps. The regular weight version opens fine.
Mac OS X Mojave 10.14.6
Does it open with Glyphs Mini 2? You can download a trial from the Get Glyphs page.
I’ll give it a go – we have another user/app who may be able to open it – will try that too
Fixed – our other user opened it successfully!
Mods: please close topic