Thats funny. I cant get mapsend lite to work for me at all!
I have Magellans Mapsend "Streets and Destinations" and "Mapsend Topo" software on my computer with Mapsend Lite. With these I am able to load waypoints by way of GSAK files to Mapsend lite. Within Mapsend lite there is a map manager which alows you to use either streets and destinations or topo maping.
I alos make sure that I save any pocket queries in mapsend lite within the My GPS folder and extract the zipped file there. This allows me to load them into Mapsend Lite. As long as the files are in the Mapsend lite "My GPS" folder they can be loaded onto the map as Waypoints and then uploaded to the Magellan Meridian GPS. Hope this helps.