Mounting objects wierdness

I'm having some buggy situations, and I can't tell if its our codebase, or TSE itself. I can mount my player to an item, but I cannot mount the item to the player. I've added hooks and debuggers everywhere, and it appears to be mounted fine. Even using getMountedObjectCount() will list it. However, it never renders. Mounting the player on the object is just fine though, although a bit dizzy when its a rotating object :)
Images aren't really suitable here, so I dont want to go that route if I can avoid it.
Is perhaps this aspect of TSE rendering temporarily out? Theres so much green commented out code in the TS files, its sometimes tough to tell whats working, whats already replaced and just hanging the old code still, or whats waiting to be finished.