I'm using a G5 iMac who's mouse pointer will unexpectedly jump to another part of the window. I've had the mouse replaced, the settings adjusted, and even tried it on a different user profile with no luck. Has anyone out there seen this problem before? Any solutions? Thanks.

Could be as simple as dust in the optical sensor of the mouse.

Right Giz

I also had the problem using a mouse without a pad - some surfaces more so if it is reflective will cause some problems

I'm having the same problem with a trackball. But not on all computers.
Hey Apple...!

Try a different USB port?

I must have wasted countless hours on this problem before I found a fix. I run both mac and windows machines and this happens only with macs!. I reported it to Apple, and to various forums and I would get nowhere fast. The pointer would suddenly jump around often to the top left carrying whatever object was selected. It was a real drag!.

The fix is simple. With the laser mouse avoid wooden or reflective surfaces. Use a good mouse mat and it goes away.!. Unbelievable.

What causes it?, I think there is a bug in the mouse drivers. The laser gives false signals when there is reflectivity and Apple should know how to filter them. This has been going on since 10.3.

The wireless mighty mouse does not do this trick for me. Don't ask why its all a mystery.

Thats kinda old news

To be honest I got the same on a PC - if the surface is reflective , keep in mind a wood surface have some kind of polish on it , in fact I got the same behavior on a Dell laptop with a MS mouse on a sheet of plain copy paper , I switched the plain paper to one that had text and the problem went away.

Hmmm. Maybe it's a problem with the mouse's resolution. I have no problems like that with high resolution mice.