It is a software issue!!!  I have 2 clients that should have had sizable (hundreds of thousands) taken out on 4/15, and after wasting many hours, today Intuit posted an alert that the problem is payments for 4/15 are being added to the 6/15 payment.  We now have to contact IRS and change the 6/15 est tax payment to the correct amount, and go onto direct pay and pay pay the 4/15 payment.