Mesh Resolution slider is at 10m/pixel
Mesh Complexity slider is at 100
Advanced Animations is checked
Wrong mesh settings will only make the jetways to appear at a different altitude than the terminal, but not disappearing entirely. And Advanced Animations unchecked will only stop the animation.
If they have disappeared entirely, it can only due to another AFCAD in conflict: jetways are inside the AFCAD, and are the only thing we don't handle with our modules (which is why, when the Trial expires, you'll see just jetways), but another AFCAD in conflict can exclude them.
Another possible explanation is, if you have AES installed, but not active or correctly installed so, it's able to exclude our jetways, but its own replacement ones do not appear for any reason.