I transfer waypoints all the time using Spanner mode. I'm 100% sure that's not the issue.
The few times I've had issues transferring it has always boiled down to a corrupt waypoint and the only way to get things working again has been to delete all waypoints from the GPS. That's fine if you're wanting to retrieve a track, not so good if you're trying to retrieve a bunch of waypoints for stages of multi's you've recently completed.
Contact Garmin and see if they have any advice.
Ya, I'm not actually sure about spanner mode, lol. Guess I'll have to contact Garmin. Is there an efficient way to delete all the waypoints?
Thanks so much for the responses. All have been helpful.