Can't upload waypoints

I can't upload waypoints anymore.  This function used to work until very recently.

I'm using Mission Planner 1.3.49, and I also tried 1.3.48.  Same problem.

Setup:

Win10/64

APM 2.6

Now EVERY time I try to upload any mission I get the following error:

------------------------------------------------------------------------------------------

Upload failed, mission was rejected by the Mav.

item had a bad option wp#1 MAV_MISSION_INV

----------------------------------------------------------------------------------------------

If I load an old, stored mission, it works.  But any new mission will not.

Another computer works.

What is going on?

See attached screenshot

Mission Planner Error.jpg

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