TUAW.com blogger David Caolo warns that Mac OS X 10.6.7 introduces issues with PostScript-flavoured OpenType fonts. In a thread on Apple’s Discussions boards Kurt Lang describes problems with regards to printing and PDF handling.
After extensive troubleshooting Lang concludes that the issues only arise after updating the OS X – his installations of Adobe Reader or Preview were unchanged, and everything worked fine in Mac OS X 10.6.6. Furthermore TidBITS publisher Adam Engst reports that the impacts are wider than one may suspect. He describes the problem as follows.
As the bug only affects Mac applications that rely on Mac OS X’s mechanism for rendering fonts, designers using programs like Adobe InDesign are safe. Those applications have their own rendering engines, making them immune to these issues.
Apparently Apple is not yet working on the issue. If you haven’t updated to Mac OS X 10.6.7 yet it is advised holding off until Apple resolves the situation. According to a tweet by San Diego based graphic designer Joshua Robinson (via the incomparable Typegirl), the unofficial answer to fixing some of the font problems in OS X 10.6.7 is to clear your font cache using the free multi-function utility OnyX.