You don't say:
- which airplane you use, how it's configured (supported by GSX or not, made from scratch by you, supported but edited, configuration made by the developer, etc.)
- the airport used. Please don't say it happens "everywhere", but indicate precisely the scenery used, the gate used, and which kind of jetway it has ( default replaced by GSX, SODE made by the scenery developer, etc.)
- how many passengers you set when you turned off the estimate passengers option.
- if you were on a parking with no jetways, if you had a Bus AND stairs
- if you saw any messages from GSX explaining WHY there wouldn't be passengers. Usually, if there a reason for not seeing passenger, GSX will tell you
- if you bought GSX L2, or just GSX. Yes, this should be obvious, but I had to ask.