I am experiencing a problem that I believe is due to Font Book (or at least fonts). Recently, many apps will not load (such as Safari, Apple Help, Disk Utility etc.) after using Font Book to install new fonts. The app will bounce a few times in the dock, but the loading will stall with no error message. However, if Font Book is currently loaded, any offending app will load fine. Main apps such as InDesign and Photoshop are unaffected.
Any ideas would be a great help. I am using OX10.3.2