Transferring routes from mac to Nuvi 750

i could use a hand. I purchased the Nuvi 750 as well as the newly released City Navigator NT for Mac. I downloaded the Garmin Webupdater as well as the Garmin mapmanager and Garmin communicator. I can create routes on my laptop. My laptop recogizes my nuvi. On the left hand side of the screen, I select the route that i created and then click the "send" icon at the top of the page. At this point the Garmin Mapinstaller program always opens and wants to install maps. The status bar at the bottom of the page says that a route has been sent, however, when I properly eject my nuvi from the laptop and restart it, I select /tools/routes and there is no route there for me to select. If instead of clicking the "send" button I opt for the receive button, all of "tracks" etc from the gps unit do in fact appear on my laptop. It seems as the nuvi and my mac are only having a one sided conversation. Files can make it from my nuvi to my laptop, but not the oter way around. Any suggestions, ??Thanks.