I have been having this issue when I want to create a drawing of a sheet metal part.  Solidworks will not select the tangent edge of a part.  For example if I have a top view of a simple formed box with the edges turned down. I can"t select the outer tangent edges to measure.  It will allow me to select the top inner  tangent edge though.   You move the mouse over the edge and the edge indicator will not show up and if it does it is nearly impossible to select.  It only happens when trying to dimension the outside tangent edge when the bend is into the paper.  If the part is facing the other way with the flanges pointing out of the paper I have no problem selecting the edge.

Anyone have any idea why this is happening. It is taking about 10 times longer to create a drawing than it should.  Please help this is driving me crazy!!!

Todd