As explained so many times, GSX doesn't have any control over jetway, if they work or not is completely not related to GSX. Also, it's not clear which airport you are referring to (default or 3rd party), and which jetways you are referring to (GSX replacement jetway or 3rd party jetways.
Because, the only possible reason for jetways not working because of GSX, is not having excluded GSX replacement jetways on non-default airports. If you did that, then GSX is completely unrelated to your issue.