If you Right Click on a Folder (that contains subfolders) and tell it to "Open Folder and SubFolders", it spits back an error about a subfolder being open, even if it is not. The only way around it is to click on some other unrelated folder, then Right Click the folder you actually want. Honestly, all we want to do, is see how many images are in all the subfolders (ie: the whole job). It is very clunky to do a simple task.
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