Wigram can cause online problems (CTD).
Here is what Rob (creator of Wigram) suggests:
Border Reiver, on Jun 16 2009 - 04:05 PM, said:
I have been meaning to look at Wigram again as it is one of mine. Personally I have never had a problem there, which you will appreciate makes it very hard for me to test if any changes I make to see if they help or not. Again it is in the Montjuic camp that there is nothing materially wrong with the 3do or the trk file that should cause lockups. I have notes from a recent league race showing where people had lockups that I will look into when I have time to see if there is a clear pattern. Something else I wonder about with some of these is if people run with various graphics options turned off. Depending on the object classes chosen certain odd things can happen at some tracks if not all options are enabled. It is a long time since I made it, but I vaguely remember some sort of oddness about Wigram to do with object classes for some of the outfield stuff that was used to mask some clipping. As I recall turning on all objects got rid of this, but as I say it has been a while....