How to clear the game's cache
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Sometimes it can help to clear the game's cache. Here is how you can do that:
Mac
Delete the following folder:
~/Library/Application Support/Overgrowth/Data
Where '~' is your username.
Windows
Delete the Data folder inside Overgrowth's user write directory. On a default modern Windows install this is usually:
%USERPROFILE%\Documents\Wolfire\Overgrowth\Data
If your Windows Documents folder has been moved, for example through OneDrive, use that Documents folder instead:
<Documents>\Wolfire\Overgrowth\Data
Do not delete Program Files\Wolfire\Overgrowth\Data.
Linux
Delete the following folder:
~/.local/share/Overgrowth/Data