Problem Creating Overlay With Afcad

I want to create an overlay airport using Afcad. However, I'm having a slight problem. I created an overlay using the example within the Afcad help files to create an overlay for KLAX. I followed the instructions to the letter, and tested the new overlaid airport in FS2002. Everything appeared to be fine. Then, I went to add the new airport in Traffic Tools so as to create flights using the new overlay. When I go to compile, I notice the new airport is recognized, but then when the flight plans start to compile, the compiler stops at a certain point and crashes. I found the flight plan number where the compiler crashes and can not think of any reason why it would do so. Has anyone had a similar experience, and does anyone have an explanation for this? Thanks.