After using various retouch tools, Aperture often returns to the original image and I can't get my retouched image back....any ideas?

After using various retouch tools on an image, Aperture often (but not always) spontaneously returns to the orginal image and I have to start all over again.....this seems to happen most often after I use the clone tool.  Is this a new bug or what?  It just started happening a few weeks ago. 

I fond the answer. Inexplicably,some of the song tracks, the 'deepest' files in the structure, had become hidden. There was no clear pattern - most of my music files come from CDs, with a small number of legal downloads (mostly from iTunes). So although the artist and album folders were not hidden, if there were no unhidden song files in the album folder, apparently iTunes skipped the artist.
Changing the attributes of all music files to unhidden took care of everything.

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