I seem to have the same issue now too. Update my XP-8 to firmware 2.2 to fix issue with sense inputs not working correctly within a macro. Now my T3-Vz doesn't talk to the XP-8 anymore. Definately something going on with that.

To make matters worse, in my haste to get it working, I accidentally plugged the ZM-24 into the XP-8's expansion port (right below the COM port) and I think I fried my antenna. The ZM-24 smoked and let off a nice burning odor. Not a very fool proof design if you ask me.