Not a problem
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There really is no way to do what you want to do without huge alteration of how the program operates. You see when you have subcats under a parent cat the latest upload is displayed for the cat which means the last image to any of its children so your link is always going to go to the cat last uploaded to on that thumbnail image. It replaces the link you see for last image uploaded on the forum display. If you want to view the parent cat you use the text link not the thumbnail so your best using the forum display if you find the gallery one too confusing.