**(Fair disclosure: OfficeforMacHelp is my site. See Kurt Lang's directions here to remove font caches See Font Management in OS X, by Kurt Lang, for more info on fonts. You can select to let Font Book disable or remove duplicates, but I’ve found that it removes the one you have not been using rather than selecting the best option. * Step 6 – remove or delete duplicates is where the tricky part comes in. Duplicate fonts will be marked with either the yellow badge or a black dot.Ħ. Under File in the Menu bar, select Validate Fonts.ĥ. Now click in the list of fonts and select all (Edit > Select All).Ĥ. Open Font Book in your Applications folder.ģ. In addition you might want to delete the duplicate fonts.ġ. it's a faulty description on a generic error that can be triggered by all sorts of things. Unfortunately, the 'not enough memory' error message has been known to occur when the issue has nothing whatsoever to do with memory.