Content from ThinApp manual (page 66):
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The CachePath parameter sets the path to the cache directory that stores font files and stub executable files.
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and,
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Using a USB key might involve forcing the sandbox on to the USB key. If you store packages in the \VirtApps
directory on the USB key, you can force the cache directory to reside on the USB key.
CachePath=Sandbox
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So, if you are saving fonts in your sandbox using Cachepath, it will keep changing its size with entry of every new font.