'Apple Font Pack' Fonts not Working in El Capitan

After upgrading to El Capitan, the fonts in 'Apple Font Pack' that Apple used to sell a long time ago (for example, Garamond Narrow), display properly on screen but DO NOT DO SO when the document is converted into PDF or viewed on screen with 'Open PDF in Preview' option for printing the document - fonts are replaced with small empty squares. This is happening with every font in the Apple Font Pack. This problem DOES NOT EXIST t in Yosemite or earlier versions of OS X and is SPECIFIC to El Capitan. As, Garamond Narrow is my preferred font and as all of my documents are prepared using this font, these documents have suddenly become useless as they cannot be distributed as PDF documents. Hope I can find a solution to this problem, short of reverting back to Yosemite.