I never use mask, in fact I omit the line pertaining to mask altogether. Using masks are problematic and there could actually be a bug in Aerofly with using them.
I guess i'll have to test with them. Give me a little bit here as I look more into this, but since I don't use mask and have never seen pop-up of scenery then I suspect it's causing some type of problem with your sceneries.
The goal for geoconvert to be successful is to make it as simple as possible.
Thanks Jeff. I forget where I got it from. I think Rodeo advised it at some point when I was having trouble. A month or two back now.