Describe the problem. Be as specific as possible!: Well, every time I mount a jagaur while not on a rope, my hit-box seems to go crazy and assume that I'm being attacked be a monster nearby (if there is one). It was quite a surprise when I logged back in and remembered that I was in an area that could nearly one-shot me if I was unmounted or didn't have Decent Hyper Body on.
Images of problem
As long as I mount on a rope or far enough away from monsters, this isn't an issue, but this will have some seriously annoying drawbacks when it comes to PQs with jump quests and the like. Not to mention the fact that I can't cast Decent Combat Orders while mounted and have to cycle on and off of it every couple of minutes.
I'm not sure if this also applies to Mechanics, since their mount just appears under them, rather than having them move forward and then jump backward.