IRS Not sending Refund after 21 days. Its March 4th and no refund yet. Is anyone facing a similar situation?

IRS Accepted my refund on the 11th/12th, but have yet to see anything approved. I check the IRS refund status link frequently and it has moved from the 3 bars, where it says "Accepted" "Approved" and "Refund Sent" to 

 

"A refund date will be provided when available"