I encountered a strange bug when resizing nfsfan83's "Africa" track. Block #2's XYZ ptCentre coordinates gets messed up and moved to the center of the track. This results in the block being invisible when in the game. (see screenshots)
This bug does not occur on other tracks (perhaps because the way "Africa" was built?).
Anyway I think this can be solved by making a block's ptCentre editable so that the coordinates can be set properly. It is similar to editing the center of an extra object. Do you think this is possible, JimDiabolo?
BTW, scaling "Africa" using 0.75 factor solves the AI traffic spawning problem, makes the AI opponents drive faster/smarter, and it gives a better sense of speed.
EDIT: FYI "problem in game" screenshot is taken with the camera view outside the car. The car turns invisible along with block 2.