Have u tried just using a new interface and downloading isboxer. Ive been toying around with getting rid of macaroon cause of the problem your having plus the long periods of no updates, I went back to wow interface with isboxer and had no problem. Each character got the vehicle bar up and without having to cast target and a macro as long as my tank is targeting a mob or ne slave they all attack that target. Makes vehicle fights fun and easy now no more is it going to work this time.