I just got my GH1, and the 14-140 kit lens rocks a tiny bit back and forth in the mount. It'll can do it occasionally when changing focal length quickly, making a clicking sound. Normal?
Maybe it's just noticeable because the zoom dial is so stiff...
Your not alone with the lens rotating then clicking to a stop when zooming in or out. Super annoying! Can't wait for new lenses. I was extremely shocked to find the zoom ring as ridiculously stiff as it is.