Hi
The latest version of the basic will now update the MARKER XML DIR and MARKER XML URL when you move your site around. We are now making use of internal shortcodes that point to the uploads dir, content dir and plugin dir - you can choose which you'd like to use.
Please update your basic (and pro if you have) and you should be able to make use of these shortcodes in the MARKER XML DIR and MARKER XML URL fields in the Maps->Settings page.