I had the same problem importing the full route to Basecamp, and ran the file through GPS Babel to clean up the file so it worked.
I also noticed that the track currently has a relatively low number of points, so it quite "angular", and in a lot of places doesn't follow the roads very closely on the open source mapping that I am using. This is not a huge problem, as long as you have the map zoomed out enough to confirm you are heading in the right general direction, but if you zoom in too close, there are sections where the straight line routing between successive track points means that the track won't be visible next to the mapped road you are following.
However, it is still officially a work in progress, so I am just waiting to see the final official version before I set it up on my GPS.