Hi,
i made some adaptions (mainly ligatures) in an existing monospace font and exported it.
When installing, Mac OSX warns with a fatal error called “Überprüfung des Systems”.
When checking the font in FontForge, it says following warning:
“The following table(s) in the font have been ignored by FontForge. Ignoring “DSIG” digital signature table.”
Did you make the fonts with Glyphs?
The dsig table it exported to make Windows recognise it as OpenType font, but is empty and should not cause problems. Does the validation show any other info?