CC disappears after editing room designation

I'm not entirely sure where to post this, and I've searched the forums for as many word combos I can think of and found nothing. So.  I've located my cc just fine, and when I click on the package file the object shows up in the preview window as it should.  Except a vast majority of the objects don't have a room designation, just type i.e. clutter, misc. Here's the problem - for two of the objects I added a room. One was listed as clutter the other as misc and I thought adding a room would make them show up in that room when using cc in game by room instead of type.  After I added a room designation and saved, the preview for the edited cc is gone.  I didn't change anything else in the categories, just the room designation.  These were the only two I edited.  Why did it disappear?  Did I bork it?  Can an item not have both a category and room designation?