Let’s address the update first – I don’t understand what you mean by the post has been updated but nothing happens. What do you expect to happen?
Publishing the post can be used to re-create an automatic map with a new location. It has no effect on the POI display or custom icons filter.
Please try updating the location for an existing post and let me know what happens:
1. Check you have ‘overwrite existing maps’ checked in the settings
2. Edit a post with a map named ‘automatic’ that was created from the ‘directions’ field
3. Change the ‘directions’ field to ‘Paris’.
4. Publish the post
The ‘automatic’ map should now show a marker on Paris. If it doesn’t, there should be a custom field called ‘mappress_error’ that will tell you why.