AutoCAD Civil 3D :: Intersect With And Curved Pipe

I'm using the Intersect With method with two pipes. The Intersect With method doesn't appear to work with curved pipes if the pipes do not cross. If they don't cross the method works, but if they don't then it doesn't find the intersect points properly. This appears to be an issue with Civil 3D 2010 to 2012 API.

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In the screen cast image the pipe on the right finds the intersection point with the straight pipe on the left, but not the curved pipe that is in the middle. I've had poor results trying to put in support requests for API related issues.

For Civil 3D 2010 here's the code that isn't working:

oPoints = new Point3dCollection();
Pipe oLateral = (Pipe)lateralObjId.GetObject(OpenMode.ForRead);
Pipe oMain = (Pipe)mainObjId.GetObject(OpenMode.ForRead);

oLateral.IntersectWith(oMain, Intersect.ExtendThis, oPoints, 0, 0);