Jumping mouse pointer

I've seen other posts describing a problem similar to mine. But I have not been able to resolve my problem. I'm hoping someone can suggest a resolution. I'm using my Mac Pro (early 2009) with a 4850 graphics card. I have always had 2 monitors attached. Both are Viewsonic. One is a 19" VA1930wm. The other is a 22" VG2230wm.
For a few months now, I've noticed that my mouse pointer will jump around on the screen, making control very difficult, especially when playing video games. I took my Mac to my Apple Store to have it checked. They ran several diagnostics and were unable to replicate the problem. Btu here at home, I continue to have a problem. I thought it was a problem with the blue tooth, but I also have the problem when using corded mice.
The other day, I bought a new corded mouse to use. I noticed that the jumping problem was very consistent. It happened at a very constant time interval of about 2 seconds. As I considered this, I realized that when they were diagnosing the problem at the Apple Store, they were only using one monitor. So I decided to disconnect one monitor and see what happened.
I disconnected the 22" monitor, leaving the 19" connected. Immediately, the mouse jumping problem went away. Then I decided to switch monitors. I disconnected the 19" and reconnected the 22". The problem came right back. I then switched the 22" monitor between the two video ports. It didn't matter which port was used, the problem persisted.
I contacted Viewsonic and, after some discussion, they gave me an RMA to send the monitor in for maintenance. My question here is whether it is a problem with the monitor or if it could be something else. If anyone has any suggestions, I would appreciate hearing them.

I just got a new mid-2010 8-core mac pro and this same problem is occurring for me. I have a logitech mx revolution and when I first set the system up from scratch it wasn't working well so I switched it out for the magic mouse it came with. The same thing was happening with that. I then tried magicpref to see if that somehow fixed it. It didn't. Since then I've removed the logitech control center and magicpref utilities and even tried a wired mouse. I'm still having the erratic mouse movement.
I haven't tried disconnecting my second monitor, but what's strange is when I start up the mac pro the secondary monitor flickers for a few minutes. I have no idea why it would do that or if it's related...

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