Reset all Gates to default and unload GSX 2
I would like to know if the issue can be fixed, instead, by checking the "Disable RTT" option, which will disable only the jetway number, but will keep the new jetways.
That would help understanding if your issues are "just" the new jetway texture which are too large for your combination of system/settings/other addons, or it's specific to the jetway number, which use a new (officially supported and fully documented) rendering method that we are probably the first one to use, so it's undergoing its first real world testing now.