Recently I made a macro and tried to drag it on to slot 7 hot bar three.

As soon as I dragged it on, the letter Q that was bound to the button disappeared from the box and Q although bound to the button does nothing.

If I bind Q to hot-bars one or two, I can place any skill or macro on it, and it works like normal.

If i bind it to say bar 2 then move it back to three, it appears like normal, but as soon as a skill is even touched with the mouse to drag, or even if the lock is pressed to lock bars down, Q disappears again and ceases to function....

I can see Q in the box, only when Im dragging skills about, and it looks sort of greyed out.

Anybody else experiencing anything like this and know a fix ? Its really frustrating not being able to use Q in that slot.