Same here - the jetway page shows the correct number.; however, all of the rendered jetways show the same (wrong number).
This clearly indicates it's not a GSX problem or a problem of the GSX customization file. So it must be a video driver issue, most likely a tweak or a setting that is rarely applied, otherwise thousands of people would have reported it, not just 3.
Where do I go to remove all of the customizations for GSX? What registery keys are involved? How do I completely remove GSX from the system to start clean?
I don't think it would make any difference, since the customization seems correct. However, if you want to remove all customizations from GSX, just remove this folder:
%APPDATA%\Virtuali
and REINSTALL GSX, using only the latest full installer, and nothing else.