I am trying several of the maptips samples on the Interactive SDK, and I just cannot get them to work with my particular service layer. I can step through debugging, and the features are being queried, and added to the graphics layer with a valid symbol. They just aren't showing on the graphics layer.
For instance, I have tried a sample similar to this SDK sample, using our service layer, and the code runs through like it should work, but again, no graphics show.