Xorg only allows access to 1 screen/monitor

I actually have this problem on two separate systems, both running an up to date stable Arch install. Both have the same xorg version (X.Org X Server 1.9.2), both running 2.6.36-ARCH kernel, both on x86_64. One is using an nVidia GeForce GTS 250, the other an ATI Radeon HD 4250. Both are using Fluxbox as the window manager.
I can use the main display and it works perfectly, but the 2nd display doesn't seem to have access. If I load X via startx, the first display loads just as it did before the problem started happening. The 2nd display loads, Fluxbox's menu bar displays at the bottom, and I can even change the desktops from 1-4. However, if I try to run any apps on the 2nd display, nothing can open it. I've tried running urxvt, chrome, anything, and get errors such as this:
(Opening a terminal app) urxvt: can't open display :1, aborting.
(Setting a desktop background) Esetroot: Unable to open display :1
(Running chrome) (chromium:5872): Gtk-WARNING **: cannot open display: :1
All the same. My systems rarely reboot, so it's hard to pinpoint what package could be the problem, as I never restart X or the system after upgrades, usually unless there is a power outage. I have tried removing all Fluxbox settings and starting with a stock setup, and the problem is the same. Any suggestions?

Unless things have changed, I'm pretty sure mixing ati with nvidia is tricky could be your trouble. I never tried mixing the two, but read a few times it's possible and think it's best to install the ati driver first and configure it before setting up the nvidia deiver. Even so, I think you may have to work out some dependency conflict between the two drivers? If you had it working before, I'm sure you figured all that out. Look at your /var xorg log file for EE errors. It will no doubt point you in the right direction.

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Xorg only allows access to 1 screen/monitor

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