If I create a 5 day round trip that is within 1 day driving distance, Trip Planner creates 3 empty days. I can use the three empty days to drag waypoints from my collection to the empty days shown for the trip in My Collection view. If I drag the waypoints one at a time, two waypoints create a route in trip planner and life is good. If I select 2 waypoints and drag to the empty date is crashes BaseCamp.
This is a great feature, please don't remove to stop the crashing. Two drags is better than none.