First off – love this plug in, thanks so much for putting it together.
I have a mashup that was working on an older version of Mappress (pasted in below) but I recently upgraded to 2.40.3 and its no longer showing anything on the map:
Could you please provide the URL for that map so I can trace it?
If you’re upgrading from a version prior to 2.39, please also see the FAQ – most problems with map display are because of a missing wp_footer() call in the theme: