1. Google seems to often size the infowindow incorrectly (with scrollbars). Here are a few things to try:
– Use a bigger map (the infowindow size is limited to about 1/3 of the map size)
– Specify image sizes (in the img tag, specify width and height)
– Use the MapPress ‘infobox’ instead of the infowindow in the MapPress settings. The infobox should expand correctly, and it can be sized using CSS.
2. MapPress ‘filters’ are like WordPress ‘filters’, they’re hooks for your own code. Filtering by location type isn’t supported by MapPress, although you can use PHP to display a map using the current WordPress search category or tags.
3. That’s not possible, but you can do this: create 1 post per POI and insert a map with just a single location. Use a mashup to display all of the posts together; when the user clicks on a POI, go to its post, where the user will see a map of just that location.
4. There’s a bug in 2.40.3 that is preventing shadow display. It’ll be fixed in the next version of the plugin, but it’s probably a moot point because Google has announced that in the next version of their maps API they won’t support shadows at all. Please see here for info about their up-coming ‘visual refresh’: