Hi,
Have you pre-programmed the chirp before with a Geocache device first such as an Oregon unit?
The display simulator can have some issues with chirps because they differ slightly from the profile in that they do not automatically rotate through the programmed pages, so the simulator relies on page 1 being programmed with the correct number of pages being there so it knows how many pages it needs to ask for first.
One workaround if you don't have access to a Geocache unit first is to program page 1 yourself using ANTware II. Ack [01-FF-FF-FF-FF-FF-02-FF] to the chirp to program page 1 to indicate that only 2 pages are available. You can find the channel parameter details in the device profile. You also need to use the ANT+ Network Key as well.
Cheers