Flattened Sheet metal missing section

Hi,

   I've been having this problem where I create a sheet metal part and flatten it and a section of the sheet metal disappears.  I've attached a basic part with three flats and two bends.  Notice if you suppress the flat-pattern you see the whole part, but when unsuppressed, one of the wings dissapears.  I don't think there were any issues when I converted the solid into sheet metal.

SolidworksSheet Metal