Monotype support had this to say when I reported the issue:
"Our development team is aware of a compatibility issue between our SkyFonts software and MacOS Big Sur, which causes synced font data to be de-synced frequently. This issue is currently being investigated so that the issue can be resolved across the platform, as it has affected multiple users."
Then they wanted me to do this, which I thought was risky:
Apologies for the continued difficulty. Can you please share feedback based on below steps:
-Quit SkyFonts.
- Go to User Directory (Home Directory)
- press (SHIFT+COMMAND+ . ) to show hidden directories.
- Go to Library -> Application Support
- There will be one hidden directory (also locked). The folder name format will be ( “.{Machine Serial Number}-8cbef5ba”)
- Right Click on the directory and choose “Get Info”. Make sure SkyFonts is not running before doing next step.
- In Info panel uncheck Locked option and then set Privilege as ‘Read & Write’ for the user.
- Then delete the directory. If any folder inside this directory, then delete them as well, removing Lock and allowing ‘Read & Write’ Permission.
- Once all complete now run the SkyFonts client again and do login in with credential. Check if issue still occurs.
Note: I did not try this and if you do, do so at your risk!