Still on my PC, I uninstalled the original versions of the fonts and reinstalled my new versions. I did a binary comparison of the original font files to the new ones, and only a few bits at the beginning changed, so I believe only the header was modified and the font data was untouched.
#HOW TO EMBED FONTS INTO POWERPOINT WINDOWS 10#
On my Windows 10 PC I downloaded Microsoft's Font Properties Editor utility and opened each offending TTF font (I did not test this with OTF), ignoring any warnings it gave me, and then re-saving it at the end with a new name. Since this didn't happen for all fonts, I began to suspect an issue with the font files themselves, possibly with the header which contains the properties.
This happened with both OTF and TTF fonts.
#HOW TO EMBED FONTS INTO POWERPOINT INSTALL#
Install Embedded Fonts Some of the embedded fonts in your presentation cannot be installed.
When that presentation was opened by newer versions of PowerPoint Mac which should support embedded fonts according to Microsoft, the user got the following error popped up: I purchased a professional font and embedded it into a PowerPoint 2019 presentation on Windows. Opening these fonts with this utility and re-saving them and re-embedding them fixes the problem. TL DR - Some fonts have a header format which breaks PowerPoint Mac. I just wasted a couple of days troubleshooting a problem with embedded fonts on PowerPoint Mac so I figured I'd share the solution with the rest of you.