I am using ArcPad 8. The system path was originally set wrong somehow, but I changed it to C:\Program Files\ArcPad 8.0\System so now I don't get an error about a missing PrjData.dll file. Still, all I get is a ding when I try to add a layer.
Fortunately I am able to add a layer on the PDA, but I wanted to do all the setup on the Desktop. Is this just a But with the 8.0 desktop?