I don't remember offhand how to get this to work.  Is there something on the Fed Info Wks to indicate that the taxpayer is disabled and/or has dependent care expenses?  I think it would either be up top or way down at the bottom with the checkboxes for other obscure situations.

Also, on the 2441, the disabled taxpayer is deemed to have $250/month of earned income for the purposes of determining the credit.  You're probably running into a "no earned income" limitation somewhere.  You might need to right-click and cross-reference some of the fields that are automatically populated by the software to link back to the source.

This doesn't answer your question but might point you in the right direction.

Rick