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I'm having this issue in 2012. I can get the yellow connection grips to appear, but sometimes when I hover over them, the coincident constraints do not appear. Very annoying. Very troublesome. Reloading the drawing seems to clear it up... until it starts happening again...
Is anything else highlighted (red)?
Attach the file here that exhibits this behavior.
Right click the line near the desired end and select Delete Coincident Constraint. This will also work on circles that share the same center point.
Ref: http://inthemachine-autodesk.typepad.com/blog/2006/05/delete-2d3d-sketch-coincident-constraint.html
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