I am wondering if anyone else has regular problems with Arc Hydro. I've taken two courses from ESRI on Arc Hydro, am a experienced GIS user, have v10 and have been using Arc Hydro for several years. I don't work with it constantly, but I've used it enough that there is almost no "learning curve" when I do get to using it again.
However. It seems that using the extension never (ever) works smoothly. For example, yesterday I started a new project, and got through just about everything with very few problems. Then this AM I started working on it again, had to backtrack and recondition the DEM again using a refined agreestream layer. I tried to use model builder to do some of the processing but it hung up on flow accumulation though I could do it using the menu bar.
Frustrated with that, I deleted all the layers and started over with the same mxd, rawdem and agreestream layers. I got all the way through point delineation just fine. Then I tried to run the batch subwatershed delineation and I got the dreaded "Object reference not set to an instance of an object." error. Very frustrating! I've changed not settings or defaults.
If you've had similar frustrations and have finally come to some solution to the madness, I'd love to hear from you.