This has been discussed several times on the forum. If you don't see animations, it can be caused by one these:
1) You have the "Advanced Animations" option turned off in the Graphic Settings. The GSX installer turns it automatically On, but if you reset your settings or turned it Off for any reason, all human animations won't work anymore.
OR
2) You are looking at the marshaller from too far away AND/OR with a too wide zoom setting. There's a feature in FSX that disable animations after a certain distance for performance reasons, and we can't do anything to prevent it, you simply must go closer to the object and/or zoom in a bit.