Another possible source or solution for this problem:
Corrupt cache of fonts used. The font cache seems to work on a per user basis. They are also localized to the client machine not the server.
On the client go to Library>Caches>com.apple.ATS. Folders inside are listed by user ID #. Simply put the folder with the ID # for the user having the font trouble in the trash. Restart. Empty trash. Font problem went away.
This may be the actual problem. The earlier solutions I found only changed things in the short term.