I was expecting to have to mail out a few overlooked extensions (located in MA) on the 16th, but surprisingly was still able to efile them on Tuesday and they were accepted.  Yes, found the 4/17 debits now generating a Fed diagnostic but not for MA.  I simply changed it to 4/16 waited til evening to transmit. By the time it really gets processed, it'll be debited on 17th or 18th anyway.