I purchased the FSDT Zurich airport, but the parkme feature is not working despite having GSX services. When I pulled up to the gate there is no Marshaller and the ParkMe sign is just blank. The ground services work when unloading passengers and luggage, etc. I have downloaded the GSX full installer again but it still does not function at Zurich. I have read that GSX services is required for the Parkme to work, but despite having GSX, it does not function. Can anyone assist me with trouble shooting this problem?