If you click Add Below the problem goes away.
Thanks. Doing what you suggest helps a lot but the columns are still not wide enough to contain all info. As an example, it's like an column in Excel that is not wide enough and some of the data is truncated. In 1.3.15 all was well so I don't think it's anything I did or the computer did.
Agreed. It is just a work around for now. You can go back to a previous version here http://firmware.diydrones.com/Tools/MissionPlanner/
This might of been my fault, explained here: https://github.com/diydrones/MissionPlanner/issues/752