Hi,
I think the widgets and layout problems are due to me deactivating all plugins and switching theme while trying to figure out what the problem was.
You won’t need to do that, because the problem were the virtual pages.
To fix that I had to delete the 5 old pages (if I remember correctly 2 were no longer virtual, had been edited and had different titles but where still using the old slug).
So you must delete pages with these slugs:
location
listings
add-listing
listing-preview
listing-success
Than add the rebuild function to your theme functions.php (version 1.3 include this in GD Tools) and rebuild the virtual pages. Than I had to refresh permalinks and everything finally was working (GD wise).
To avoid corrupting the virtual pages the best thing is to avoid editing them for any reason. Everything can be done without touching them.
Let me know if this helps.
Thanks