Is there a problem with returns filed on April 15? Still in pending status after 3 days?

You can check that your return was received by the taxing authority  using these instructions: Check the Electronic Postmark of your Return. Pay close attention to the separate lines for Federal and State. They are separate statuses.

I did check the electronic postmark.  It is dated April 15 but is still in pending status.  Is the IRS that backed up in receiving e-file returns on the 15th?.  A friend of mine did theirs on April 17 and it was accepted by the IRS within about 90 minutes of e-filing using TTax online.  I'm confused.  

Once your return is filed, TurboTax has no control over the processing of your return or the release of your refund.

Here are a couple FAQs to track your refund:
When will I get my federal tax refund?
How do I track my state refund?
Why does Where's My Refund say "approved" but TurboTax still says "accepted"?