Jim - did you resolve this? I have same prob.
I have a weird situation. Activesync connects to my AT&T Tilt2 and syncs (albeit the sync hangs every now and then) - BUT THE MOBILE DEVICE ICON DOESN'T SHOW UP IN EXPLORER. Easy Sync and CERegEditor connect to the mobile device - but I can't manually transfer files since I can't find the icon!
Any ideas anyone?
Have you got SPB Mobile shell 3.5 on your device?