Did a brief search and didn't see answers to this. Hope this isn't repeating.

I have tried to create new missions (off line) and always loose the tracers. I've checked the plane in options and I've checked the mission in Builder, and it shows the proper ammo loadout. I am aware of how to modify the ammo belt in Builder and on the plane in options. Regardless, when I run the mission I've tried to save in Builer, no tracers. Specifically I'm referring to the Spit II.
This is especially frustrating since I can run the stock mission (unmodified) and even change the aircraft and get tracers. Any clues?
Thanks.