I think I see the problem: older versions stored a zero center (indicating the plugin should auto center) differently than the newer versions.
I’ve got a workaround ready for 2.47.4. Could you use the contact form to send me an email address so I can get you a copy for testing?
I think re-publishing the post should work, but only if the box “Overwrite maps when posts are saved” is checked in the MapPress settings before saving (when unchecked, it prevents any saved maps from being overwritten, i.e. for manual changes).