I’ve run into a showstopping problem during QA of a new typeface. My OTF fonts mastered in Glyphs are broken on Windows. I’m using Wordpad on Windows 10 for my testing. When text is just English it renders correctly. But accented text turns into a mix of my font and characters randomly falling back to system fonts. The characters do exist in my fonts, but they fall back anyway. Even letters with no accents will fall back when accented letters are in the text. This problem only occurs with OTF fonts, Truetype fonts work. There’s nothing weird about this font, it’s just a typical Latin typeface with a big character set (Latin Plus, Vietnamese, and Pinyin).
I tested with 2.4.1 and 2.4.2 versions of Glyphs and it’s a problem with both, so it’s not a new bug. But it doesn’t seem to have been a problem with older versions of Glyphs. I tested a font from 2012 and that works correctly.
A screenshot is attached. This is an example of me testing an OTF font in Wordpad, on Windows 10, using a dump of all the glyphs in the font. The same text renders properly in Adobe apps and Apple Textedit.
I would appreciate it if other people would test this out with their fonts to see if they have the same problem. If it turns out Glyphs has been generating fonts that don’t work with accents in Wordpad there might be a lot of broken fonts out there (and a lot of broken QA procedures).