Interesting. As in my experience its probably the most unreliable piece of software I have ever used.
I run Vista x64 with 8GB RAM, and Airnav has been reloaded multiple times onto its own C:/Airnav directory (instead of the default dir:). Ive upgraded to 4.03. Ive paid extra for the upgrade to 3D. Ive logged a support ticket with Airnav, and they couldnt help with any of the 3D interface issues. Ive tried differnt graphics cards (GTX 260, and GTX 650ti), and I still get crashes, and lots of white stalks instead of 3D aircraft. I also cannot select aircraft on the 3D display. Only on the 2D Display.
I subscribe to the Live network, and always have done to support this hobby, but I find the lack of updates abysmal. My 99 pence ipad Apps (plane tracking software) gets better support to be honest.
Ive ordered a new desktop system as a last resort to try again, but I'm losing the will to live with this software on my otherwise rock solid PC. Even with 3D settings on the lowest settings it keeps crashing.