I'm using Illustrator CS6 on OSX 10.9.1. Ever since I've upgraded to OSX Mavericks, Illustrator has stopped loading some of the document fonts even though they are enabled and available for other applications. I get the font missing dialog every time I open the artboard after a system restart. I usually resolve this by opening the Font Book app, disabling and re-enabling the fonts. This refreshes the artboard and the fonts then appear to work as normal. Initially, I suspected a compatability issue with Illustrator CS5 and OSX Mavericks, but after upgrading to CS6, I continue to have the same issue. The fonts in question are ttfs and these worked fine previously.
How can I fix this?