Sometimes MAX is real fickle about what it wants to show. Try these steps:
1) Try refreshing MAX
2) Close and Reopen MAX (i've had issues in the past with Test Panels not running and this fixed the problem)
3) Are you sure software is installed on your PXI chassis. Make sure when you Right click and select Add/Remove Software that you're not misreading each icon.(see attached)
4) Try reinstalling the NI support software described in step 3. Couldn't hurt.
Hope this is helpful,
Craig