You have to update your custom Sheet Metal Rule - This is what I found.
Don't ask me why. Ask autodesk.
1) Click "Sheet Metal Default" button.
2) Click "Edit Sheet Metal Rule" Button.
3) Select the "Bend" tab in the right pane in the "Style and Standard Editor"
4) Change the bend radius from "0.120" to any size.
5) Close the "Style and Standard Editor" and "Sheet Metal Default"
6) Re-do above and change the bend radius back to "0.120"
You are now on track.
HTH
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A circle is the locus of a cursor, starting and ending at the same point on a plane in model space or in layout such that its distance from a given coordinates (X,Y) is always constant.
X² + Y² = C²