It seems as though the process crashed before getting results (this is not uncommon- profiling by instrumentation techniques is rough on code sometimes). Can you try a couple of things:
1) Run ANTS *explicitly* as administrator (right-click on the ANTS.UI.exe...)
2) Use either sampling mode or 'attach to process' (with your process already running)
You should get something from this...
Otherwise, can you open up the silverlight console and check for exceptions?