I have an Avic-d3 and a gex-p920xm tuner. When I first installed the tuner it showed the channel and category icons, then all of a sudden it doesn't show them anymore. Anyone else have this problem? I've tried resetting both units, but same problem.

Yea, on occasion I have this problem as well, I think it is just reception problems.

Make sure the nav disc is in the unit.