This typically occurs when users do not install StreetPro as an Administrator or do not have sufficient rights to install the program fonts in C:\Windows\Fonts directory.
Resolution: Reinstall missing fonts from the StreetPro Media as Full Administrator for fonts to be available. You will not have to reinstall the program from scratch, only the StreetPro Fonts, during the installation.
You will now see the StreetPro Symbols when opening you Workspace in MapInfo Pro.