OK. I\'ll be looking for the answer, and may find it myself. I have a nasty habit of answering my own questions.
In any case, I have an app that is designed to be \"
OK. I addressed this, but I did not fix it.
I punted.
It is, indeed, Instruments making wild guesses. There was nothing wrong with the way I specified the color (however, I liked one of the suggestions here, and redid my color spec that way).
It seems to be a very small leak, buried somewhere deep in the bowels (and I mean that literally) of MapKit. There seems to be absolutely nothing that I can do to resolve it.
After several hours of brick wall/neocortex interaction, I just gave up, and made the screen controller object reusable. I simply keep it hanging around, and change the contents to suit the meeting being inspected.
That puts off the leak until the app closes.
I am such a wimp.
Thanks.