If using Serato DJ 1.8 or later on macOS, you may notice legibility issues caused by corrupt or problematic Fonts.  

If your Serato DJ Pro library looks strange (like italicized or unreadable text), it might be because of a custom font on your Mac. Serato uses Helvetica on macOS, by default.

Your font may either be corrupt, missing or there may be multiple instances of the font with the same name. 

Workaround

Font Book on macOS allows users to restore fonts that were originally included with macOS. Which should help most people that are experiencing this issue.

On older versions of macOS, this can be accessed by Applications > Font Book, then Files > Restore Standard Fonts, however on recent versions of macOS it can be accessed via Applications > Font Book > Font Book (menu) > Settings > Advanced > Reset Fonts

If using "Restore standard Fonts" doesn't help with your issue or you are experiencing this issue on a Windows computer, please open a help request.