Ditto here. I have 2 3D subscriptions. On Sunday, 3/07/2010, the 3D option failed on both boxes. First, the aircraft/ballon icons disappeared, leaving only the trails.
1. I shut down the programs and restarted them. The 3D option was gone on both boxes.
2. I shut down the programs, disconnected the boxes, reconnected the boxes, and restarted the programs. No 3D option.
3. I shut down and rebooted both PCs. I started the 4.03 application. No 3D option.
The problem is not on my end and probably not on your end. Don't let the AirNavSystems tech support snowball you with their usual arrogant response. Stay on their case until it is resolved.