I have found that if I use any kind of multiseat mount, (2, 3 or 5) that if my slaves use interact with target on me the one who mounts first it fails and bugs out.

If I use mouse broadcasting and right click on all that seems to work fine.

Is this a change from Blizzards end? I use ISboxer so not sure if that has anything to do with it.. all other IWT works fine, so I doubt it.