I am having the exact same problem: only one monitor is displaying.
I am curious though – when you say that you downloaded the driver, do you mean for the CSV5200? If so, where did you find that? I didn’t see it on the product page or in the driver download section of this site.
Oddly, the second monitor (which is connected via adapter: DVI -> DP) is “live” in that it has not gone to sleep; however, there is no picture at all. I cannot even get the monitor menu to come up. The monitor was functioning completely fine before I connected the CSV5200 to it.