Do not panic if you go to check on your refund and the IRS appears to have no record of your return. Those who file are still receiving their refunds within 10 to 21 days.
The problem is not with your refund, but merely with the IRS computer setup that gives you the status of your refund.
The IRS emphasizes that if you filed electronically and you received an acknowledgement of your filing, the agency has NOT lost your refund and you should not call to check on it.
According to the IRS Where's My Refund page,
We are aware that some taxpayers who have filed electronically and received an acknowledgement from the IRS are concerned when they visit "Where's My Refund" and are told that we have no information regarding their return. This is a temporary situation, and we expect to resolve the matter in a few days. At that time, taxpayers will be able to get an expected refund date when they visit "Where's My Refund."
If a taxpayer received an acknowledgment message that their e-filed tax return has been received, they can be assured that the IRS has the tax return even though "Where's My Refund" does not reflect that. Taxpayers should not call the IRS unless specifically directed by "Where's My Refund," as there is no new information to give them.