I believe you will need to upload the E:TT0003M.TTF or ARIALBD.FNT file actually to the printer. This is not a built in font so the printer doesn't know how to properly render it. If you have a licensed copy of either of these fonts you can use Setup Utlities or ZebraNet Bridge to upload the file to the printer properly. If not, you will have to license a copy from a font website or from Zebra.
To verify the file is not already present, you can send the command string ^XA^WDE:*.TTF^XZ^XA^WDE:*.FNT^XZ
It will print two labels showing what extra fonts have been loaded on the printer. You can send this with your driver in the "Printing Preferences" as the image shows.
You can see resident fonts by sending ^XA^DEZ:*.FNT^XZ