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An application doesn't open anymore

If an application doesn't open anymore or seems blocked on a message that reads "Caching Fonts", you have probably removed the fonts cache.

In this case, don't force the application to quit; wait for the fonts cache to rebuild.

Indeed, the rebuilding of fonts caches in some open source applications (GIMP, VLC, MPlayer OSX Extended, and so on) takes a particularly long time.

After the cache is rebuilt, the application will open again normally.