If you use parentheses mark in Font Name field the font won't load.

[shahabsiavash]

I realized it just now, I don't know. It must be new, cause suddenly 4 of my font samplers are not working, just had a hunch maybe it's because of parentheses mark, and it was it!

[kontur]

Yes, there really should be more explicit checking of the font names. Thanks for reporting 👍

[kontur]

Same as #148 in essence.