okay another mac bug...sometimes when I want to edit a line and select and move, the line moves but not the mesh. I think this is related to syncronize? and maybe operator error on my part...but it would be great if this process were somehow a little more intuitive. I mean I can not imagine why you would want the line to move and not the mesh, so maybe some kind of popup warning that says you need to synchronize?
or, I could be wrong and something else is happening. All I know is that it happens constantly off and on and I "think" I finally figured out that I forgot to either turn synchronize on or off.