When you click the save button, the resulting url does not contain the category id. http://xxxxxx.com/cart/zenmin/catego...=edit_category turns into http://xxxxx.com/cart/zenmin/categor...ategory&cPath=
The cID drops out of the url completely for this top level category.

We've been straightening this category situation up. The site has products listed at the same category level as sub-categories so the owner is moving all the products into those sub-categories. This is a top level category that has had all products moved into sub-categories. Those sub-category descriptions can be edited - whether or not they are cleaned up.

So why in the world are we losing the category id?