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That's a good thought -  I could have accidentally selected "you can be claimed by someone else", but that's not it. 
I went back to the  personal info screen, all the checkboxes are clear, I re-selected "None of the above"  (not blind, not deceased, no one else can claim as a dependent,  etc).  - and I get the same result under child & dependent care.  "..No ...  because you can be claimed by someone else as a dependent. "  Very strange.