Sometimes
Hi, maybe I can contribute a little. We use two systems set up for 6 screens each. Sometimes I get that pixel line crossing over to the next screen, and sometimes I don't, it seems that is a problem with sync signals, our systems go through VGA matrix switchers and I usually correct the problem by resetting my matrix, we also used one of the systems once to feed 19" LCD computer monitors.
I had the lines crossing over, and could correct it because I wasn't using any switcher, I pushed the auto setup button on the monitor and voila, worked like a charm.
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1 Catalyst PM Pro V4.40 m466
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ATI Radeon XT1900 512 MB
16GB RAM
OSX 10.6.8
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OSX 10.8.5
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RoadHog 4