One thing that is odd, is that doing a screen capture should NOT grab those errors, Hrrrmmmmm.......

Oh yes it should. The image of the screen is stored in the graphics card RAM and hence when you do a screen shot on a graphics card with faulty RAM the corruption does indeed show on screen shots.

P.S. When I first saw this happen myself I was very confused, because like you I also assumed that the bitmap for the screen shot came from the machine's RAM rather than from the graphics card. When you think about it though it makes sense, why waste space in main memory storing a copy of what is on screen when the graphics card has RAM dedicated to that purpose.