How to remove duplicate fonts causing issue in any application Remove font files from all Mac OS X fontfolders, except the System/Library/Fonts folder. Move font files from the Fonts folders in the Users, Library, and Network folders to the desktop or other location, and restart the computer. If the problem doesn't recur, the problem is caused by one or more of the font files you moved. Replace font files a few at a time to determine which font is causing the problem. (For example, replace font files that start with A-E to the System/Library/Fonts folder, and then restart the computer. If the problem doesn't recur, add another small group of font files. If the problem does recur, one of the font files you just added may be the cause: Remove the font files, and add them back one at a time, restarting the computer each time until you find the particular font file that causes the problem.) When you find the font file that causes the problem, reinstall the font from the origin...
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