MOD-DIAM in front of value

After updating SOLIDWORKS to the latest version you may see the following result:

Instead of the Diameter symbol, you will see the prefix "<MOD-DIAM> ". This is due to not updated  "Symbol Library File" under System Options -> File Locations:

To correct this, Delete the presented location (in this case "C:\ProgramData\SOLIDWORKS\SOLIDWORKS 2019\lang").

Then click "Add...", navigate to your C drive, and access ProgramData:

From the ProgramData folder search "SOLIDWORKS" and access it:

Access the SOLIDWORKS folder and from there locate the latest version of your SOLIDWORKS installation:

Access the latest SOLIDWORKS version folder and search for subfolder "lang":

Open "lang" folder and choose "english", after which choose "Select Folder":

Now your "Symbol Library File" path has been updated to the latest, choose OK from System Options settings:

Now when you reassign the hole value, everything should be working as before: