After you file

If that "Where's My Refund" tool above says your return is still being processed, you can phone and speak to a live IRS agent on Monday to see if you can learn anything about the delay.  Here's how to wade through their phone system:

IRS:  800-829-1040  hours 7 AM - 7 PM local time Mon-Fri

Listen to each menu before making the selection.
 
First choose your language. Press 1 for English.

    Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.
    Instead, press 2 for "personal income tax".
    Then press 1 for "form, tax history, or payment".  
    Then press 3 "for all other questions."
    Then press 2 "for all other questions."  It should then transfer you to an agent, but there is likely to be a long wait.

I usually use a speakerphone so I can work on something else while waiting.