Same problem here. It never saves upon closing, and the "Save as" dialog sometimes proposes "/" as a saving path, and sometimes "user" (but never "/home/user/MyDocs/.documents/", which is the path in which I'm currently saving my ShoppingList.xml).

The path is correct in the Shopper.conf file, and it opens the right file when the app starts.

Any way I could help to solve this very annoying problem?