Ran it last night prior to posting, ran it again just now, same issue.
I can only confirm that I can see all platforms moving.
The most likely reason for them being static, is that you still have the old model of the Cargo Loader, which will cause exactly that. Again, please be absolutely sure your firewall is not blocking the download, and the antivirus is excluded from scanning the whole Addon Manager folder.
Another possible reason, is that you are still using your own custom configuration, instead of the one that comes with GSX. In order to have the proper loader working on the Main Cargo (Side) door, the configured door in the airplane configuration editor MUST be the Main Cargo, which is of course how we configured it now. The old trick of moving the Cargo 1 or 2 on the left and rotating it, won't work any more, and of course is not needed, now there's proper support for the separate cargo door.
So, if you are sure you have the latest update, be sure you RESET the configuration for the PMDG 747, in order to be sure you are using the new one that comes with GSX.
Also wondering about the code for the bulk cargo door for the passenger variant.
I guess it's 7X7XbulkcargoDoor, but I haven't tried. Keep in mind that, in order to use it, you will have to forfeit one of the two right lower cargo doors.