Meaning: The plate boundaries for a plate system are no longer valid, or the plate system logical connections need to be updated.
Recompute the object on the To Do List.
Verify that there is contact between the plate system and its boundaries.
Check for any plate boundaries on the To Do List. Verify that Smart 3D created the logical connections correctly.
Check the parent plate for any excess boundaries. Make sure that the intended ambiguity solutions are selected.