Problem with getting compiled AI scripts to work

So after Kwoks new fabulous BM release I thought I would give AI scripting a chance myself. (Hopefully, this time I will have enough time for it...)
I am probably forgetting something very obvious, but I have no idea what.
Basically, I changed a few things in script_ai_design _creation, the race_setup and race_main_scripts. Both compiled without problems. I played the race in quick game and used the runturns cheat. The game hung while processing the races turn. After replacing the race_main_scipt with the original one, it worked again, so the problem must be with that file.
I have undone every change I made in both ai design creation and the race main scrict and compiled again, with the same result. In case I had forgotten some change, I replaced both files with Kwoks original ones and compiled them, which ultimately gave me the same error. Now I have used a file date changer, changing the data to the original one, but to no good.
So has anyone an idea what could cause this, or should I just ask Kwok to compile the file for me, using all the black magic he must use to get his entire mod running.

Thanks, Blubel