Artifacts in track preview rendering with custom cars

[Cas]

It could be, yes, that there is an array of pointers to the models that have to be loaded for each code, but the car models are not in memory while in the track section, so it points to a random location. That would explain random polygons being drawn, some extremely large, but doesn't explain crashes or how this appears to interfere with the button borders, since it's a read-only procedure to load the shapes and draw the track.