Hi
Nope, as long as you have proof of US citizenship you won't have a problem. Homeland Security will probably do a criminal records check to see if there are any outstanding warrants though,.
CBSA did that when they where talking to me before I got my Exclusion Order. Definitely good there...otherwise the CBSA said they would have detained me and deported me instead of issuing the Exclusion.
Anyways, so basically the DHS/CBP will just double check my info and ask me what my business was in Canada like they normally do when I cross?