Hi, that query actually looked OK to me. What result are you getting, an empty map?
If so, you could try a few things:
1. Add “posts_per_page=-1″ – it may be the map is showing the first 5 posts only, and they don’t have locations:
2. Go to your ‘permalinks’ menu in the WP admin and save – this will ‘flush’ your permalinks, they can get out of sync surprisingly easily
3. See if the query is working without MapPress. For example, enter these URLs: