Nope, didn't fix anything
When I go in to the Vision Engine Control Center properties for the monitor, it tells me the maximum reported resolution is 640x480, which obviously isn't correct.
I also tried with only the Acer monitor plugged in (still in the DVI port) and it still didn't work. Although, like I said in my first post, it works fine using VGA. Unfortunately, I don't have (easy) access to any other DVI monitors, so I can't check to see if they work. I did test the HDMI port using my TV though, and it is working fine.
Also, apparently 720x480 also works, so that makes it 640x480, 720x480, and 1280x720. Everything else that I tried just came up with the "Input not supported" screen on my monitor. :/
Any more suggestions would be greatly appreciated!