Thanks  for the quick  reply.  Yes, I did choose the correct county in the drop down.  No, I didn't populate the override (actually, I've tried blank, 1, and 2 in this box and none of the options make any difference).

I DID populate the address that follows because that is my situation.  The mailing address for the tax return is not the same as the principal residence, and therefore I need to populate the principal residence.  

The problem, is that even though the principal residence is populated (street address, apt #, city, state, zip), the diagnostic #55168 continues to appear, and I can't simply click the checkbox to clear it.  It continues to prohibit e-filing as long as the diagnostic is present.  

I have a suspicion that the code is looking for domestic address AND foreign address, when it should be looking for domestic OR foreign?