This is caused by a bug in the map code when using more than one map in your site, i have logged this in our system to be corrected in the next update.
to correct the problem, for now, find the following code in the webassist/google_javascript/wagmp_map_2.php file:
directionsDisplay.setMap(map1);
directionsDisplay.setPanel(document.getElementById("wagmp_directions_1"));
and change it to:
directionsDisplay.setMap(map2);
directionsDisplay.setPanel(document.getElementById("wagmp_directions_2"));
to fix the issue with the markers not showing, find each instance of:
MarkerImage('google_javascript/
and change it to:
MarkerImage('webassist/google_javascript/