I'm using taxonomy menu to create a menu from a taxonomy. I then create nodes and tag them in that taxonomy, and create a link in the menu under the same category name that was generated by the taxonomy menu module.

The problem I experienced is that if there were no sub-categories, and if the weight of the link was set to zero, DHTML would not display the link. It displayed normally with DHTML disabled. Changing the weight of the link to -1 solved the problem.