It is more likely you have a internal face in this intance. You can use the mesh>cleanup tools to find and correct the problem.
A manual way to fix this is to delete the face(s) in the affected area, look for internal faces, if you see none then rebuild the faces using append to poly, extrude edge and merge verts, and bridge tools in whatever combination you need.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 25-07-2011 at 06:56 PM.