PMDG 737-800; Cabin and cargo doors open as intended. The passengers board but disappear when they enter the cabin.
I have been having the same problem with the PMDG 737. I have tried with the 800 and 900, both purchased direct from PMDG. I am running the latest version of GSX Pro and all my PMDG aircraft are up-to-date.
I tried flipping the seatbelt/no smoking signs to off, both separately and together, after reading various posts on here, but no combination makes any difference. The checkboxes in the config manager to enable passengers are checked, and I tried unchecking/re-checking them, but to no avail. I have only tried with official PMDG liveries, including house liveries.
The passengers will enter the aircraft, but they disappear as soon as they enter the cabin, and will not re-appear regardless of switch positions or the type of camera view I am using.
All other functions of GSX work perfectly for me.