When a target is locked (showing "AC" on the screen) the manual says that:"If the incorrect object is locked, move the acquisition frame to the correct target with the [;], [,], [.] and [/] keys."
However in my case when a target is locked no matter how much I press ;,./ (actually I have these 4 keys mapped on my X45) I can't break the lock: the acquisition frame keeps following the target and the screen keeps showing "AC". I could live with this by paying attention to lock the right target from the beginning, so that once locked I don't have to unlock.
But the problem gets bigger when trying to hit multiple targets in a single pass. After the first target is hit, the screen usually switches from "AC" to "KC", but the acquisition frame still locks on the target I already hit and if I try to use ;,./ (or the joystick) to move the acquisition frame over the next target I still can't do it, even if the screen shows "KC" not "AC"! The most I can do (if I'm lucky) is to change the lock to the next target in the column when it passes the target I already hit (probably because when the targets are close enough the acquisition frame is wiling to "snap" to the other one).
Using the unlock button/key is not of much help because in this case I lose not only the "AC" but also the "KC" so I'm no longer ground stabilized and I'm lost.
I saw Ironhand's tutorial about hitting multiple targets in a single pass and Han's demo mission about column hunting, they are both excellent, looks like they have no trouble moving the lock from one target to another, but in my case it just doesn't work.