Thanks for the comments.
Darn, I still have problems on rendering! Don't know why.
Before I send it to A:M reports, can anyone test the project, and let me know if it does render or not? also try 'render lock mode'. Test it on frame 22:10, but I'll guess the problem is on the most of the frames where there is particles.
Remember to set 'Draw Particles/Hair' to 'on'
Regards
Stian
fly.zip