On a few occasions when positioning the marshaller, they appear to flip around to face the wrong way. I'm not sure how to correct this so any help would be appreciated. I've attached a screenie.
The marshaller is set correctly, according to the data in the scenery.
It's the parking heading in the scenery that seems to be rotated or, possibly, the parking is linked to two different paths from both sides, but since it only has one heading, that's the only thing GSX sees. You can fix it by rotating in GSX, so the heading there will take precedence over the one in the scenery, but if the parking can be approached from two directions, one of them will always be "wrong".