Invalid Answer message displaying on submit

I have 3 slides, each with a free form pick one quiz question. Each free form quiz is set up exactly the same*. (Checked and double-checked.) Whatever answer I select and submit for the 1st of the 3 slides yields that Invalid Answer pop up.

* I did add layers to the slide on which the quiz no longer works. (And, my intention is to add layers to the other 2 slides as well.)

My forum search yields much discussion about controlling the look and feel of this pop up. But, what I need is to get rid of it. (After all, I am selecting a circle converted to free form before I click Submit.)

What am I missing? (It's gotta be me.) Is this a bug?

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