Nuvi 1300 not showing waypoints in Map Source

[MichaelJ07]

I know you folks are mostly handheld folks, but you are also the best source on the net for info on GPSr's.

My SIL's Nuvi 1300 shows the user-generated way points on his device.  If I Receive from Device in Map Source, they show up.  Now, I make a new MS session, make a new way point, then send it to the Nuvi, it does show up on his device as being added to his existing way points.  That's all well and good.  However, if I now Receive from device, the new way point is not visible in Map Source.  Got any ideas why not?

Thanks
Mike ...... for someone else.