I created a set of CDF files for which I've opened and closed several times. But now one of those files no longer displays the cell brackets. Do I have a corrupted file or did I inadvertently press some key combination to remove those or "lock" the file in some manner? The CDF file operates just fine. I just can't edit it. I've attached the problem document.
Sorry. False alarm. I finally figured out how to fix this with the Option Inspector.