Group fixtures to a pipe and drag the group over to a dmx mover should work. Now it does not, you have to attach the pipe and the fixtures to the dmx mover separately.
As along as you are only dragging one object at a time (such as a group) this should work fine. If you have found a situation where it doesn't, please e-mail support@capture.se as you may have found a bug!
I must have made a mistake the previous time I tried this, because, as you said, now it just works. If this happens again I will let you know.