Bad spacing on one letter at one weight setting

This one has me stumped.

It’s only this one letter (X) at this precise width/weight setting.

Georg, I’ll email you the file.

John

In what app do you see that problem? Can you send me the .ttf file that shows this?

The problem appears in Illustrator but not Indesign or Photoshop.

File sent! Thanks.

I would mainly test in Browsers or FontGoggles.
If it is only broken in one of Adobes apps mans that you most likely hit a bug or a cache problem.

Works perfectly in Fontgoggles, so must be an Illustrator issue. Caching would make sense. thanks.