That's strange. I tested it on both Cspect and the Next itself. I also tested two mice on the Next. one was an actual ball-based ps/2 mouse, the other a usb mouse using a usb/ps2 adapter.
What os are you running? I have been using 2.07k (latest official distro) on both cspect and next.
Just curious to see if can pinpoint whether its a particular os/firmware or something else...