editing Vegas 12 question

wondering if anyone can answer this problem since no one on google seems to have it.

okay, I'm Using vegas 12 and i notice that towards the top middle of the preview window there is what seems to be a translucent line across it which causes a little bending effect when someone moves or the camera pans. I haven't found any thread anywhere about this subject and wonder if anyone has the same problem and what can be done about it.
it's really faint and not as bad when i render the footage into a regular video file but it bugs me that i can still see it.

thank you
 
here is a screen shot of my settings
 
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