do you have a top level folder called "My Collection". I think that contains all the data you have in all the other routes, folders, favourites etc. At the bottom left of basecamp is a search box. But it can also be set to filter for routes, waypoints, tracks etc when you are looking through "my collection" for something etc. I think...What I have noticed recently when planning routes, is that if the waypoint/favourite you want to add is not in (part of) the folder/list you are working or planning from, then its not seen. Has to be dragged into the same planning folder,to show up. Hence try using my collection to find the waypoint and then drag it to the list/folder you are working in. Hope that helps?