Same problem for me. I am trying the BBJ. I run the FSDT Installer as administrator, checked the BBJ and started the sim. The pax disappear after walking in, both in the PMDG house livery and my personal livery.
The Chime switch is in the correct position, but I tried both just to be safe.
Am I missing something?
Edit:
tried removing the custom aircraft profile from gsx, disabled the pax and re-enabled them. Still not working.