did you run `wagn update`? (see updating)
(running `rake db:migrate` or `rake wagn:migrate` directly can cause problems
I thought it was supposed to be bundle update, rake wagn:migrate, then wagn update. I had done just bundle update then wagn update, but that's how I ended up with no images, so I thought that was wrong. I can run wagn update now.
Hurrah! Nearly everything is back where it should be!