(brief rant) I have to admit a strong dislike towards columns that can be so easily enabled/disabled just by mouse dragging. I often accidentally "unhide" i.e. activate unwanted columns, when I am only really resizing.
This makes the established right-click column on/off selection pointless. Don't know how many people use columns this way (you can never really know which column is lurking there anyway), but I really hope sanity is restored. 8)
We'll see what we can do ;). The Win32 listview control doesn't have a native capability to hide columns, so the usual method is to set them to 0 width. That can result in the what you've seen.
I'll reply again on any further news about this.