Hi there, I've got a little problem with the AUM61 CarAI4 code

Following:
I copied the folder of the carAI4, replaced the player model and car models with my own ones, placed the track, which is also a model, and modified the path, deleted all blocks there are, and rebuilt the level.
Ok, works fine I thought, but only for the beginning. After driving around a bit, it seems like there is an invisible wall just where the old 'skybox' was, but how can that be? I deleted the .WMB and rebuilt the level, still there

Please help me if you can. Incase you are wondering, this is for a project intended for only one person, and will give it to her on december 24th.

Plus, if I switch the track to polygonal in WED, I get an error with the c_trace lines

Please help me, I cannot really code, and I don't know where the error is, nor which causes the error

Tanks in advance
Felix