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A nagging problem with Mark Seam

Posted: Sat Dec 15, 2012 1:47 am
by Pete's wife
Some weird stuff is going on when I try to use Mark Seam. First I select an edge of my object with ALT + RIGHT CLICK. So far so good. But Then the faces of my object appears distorted after selecting Mark Seam in the edges menu. In Edit Mode the faces of the object looks like they've been cut in half, i.e. like a black or orange triangle that is connected by three of the four vertexes of the individual face. The black and orange triangles stay visible when the object is shown in wire frame. The same problem appears when I use Mean Crease. I can't find a solution. Hence I am at the end of my tether. I would be for ever grateful if you can help me out.