It looks like Edgar may be going into the multimonitor cave, instead of me. He says he might have an idea what's happening.
I just spent a couple of hours trying to set up a better system for testing multi-monitor stuff. My problem has always been that whenever I needed to test a new bit of code, I'd have to shut down my main development machine, drag the 24" monitor into the other room, hook it up to my multi-card machine, and fire up that system. Of course, the code experiment would never work, so I'd have to repeat the whole process hundreds of times.
About a year ago I had installed an nVidia 5200 card in my main dev machine, which automatically uninstalled (not just disabled) the on-board Intel graphics chip. What I didn't know until today is that I could re-install that chip. The upshot is that I now have two monitors working on my dev machine, and can instantly see the results of any tests. This should speed things up at least 10x.
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