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In this case, don't force Gimp or X11 to quit, please wait...
If Gimp doesn't run anymore and seems blocked on a message displaying "Caching Fonts", you have probably removed the Fonts Cache.
In this case, don't force Gimp or X11 to quit, please wait...
Indeed, the rebuilding of Fonts Cache in some versions of Gimp is particularly long. For example, on a PowerBook G4/550 MHz, you might have to wait about one hour (!!!) before you see the loading window of data files, Plug-ins, Extensions... then finally the Gimp dialogs.
Once the Cache rebuilt (.fonts.cache-1 file located at the root of your Home Folder), Gimp will launch again normally.