I was using Shotwell on an old computer running 12.04 LTS. Not sure what the Shotwell version was [I've looked since, and it's 0.12.3], but it would have been up-to-date for that OS version. Got a new computer running 13.04 and Shotwell 0.14.1; copied Pictures folder to new computer; copied ~/.shotwell to ~/.local/share/shotwell. It kept all the tags and the images are there but the images don't match the tags (or vice versa) and the images are mostly all distorted like Shotwell is retaining the orientation and/or resolution for the wrong photo.
So, the question is: Is there a way to get the right tags matched back up with the right photos, etc., so that everything is back like it was? Or do I just have to delete the photo.db, let Shotwell re-index everything and start over retagging everything? (sigh)
Shotwell did give me an import log, which pointed out a number of duplicate directories that I'll be able to easily clean up. Nice.