I am having trouble with the Batch Watershed Delineation tool. I get a message that says that it successfully delineates watersheds, but the output features have a length of 0 and an area of 0, and are not visible. I always place my batch points where there is flow accumulation.
I feel your pain. However, for my latest project I used the GeoHMS toolbar menus. They seem to be the same as the ArcHydro menus, but simplified... and THEY WORKED (this time). The Batch Watershed tool worked. It created "subwatersheds" which is what I wanted.