In message <20050302032106.C86F13C023E@berkshire.machshav.com>, "Steven M. Bell
ovin" writes:
>Two of my machines have USB mice.  On occasion, and without apparent 
>cause, the system will stop seeing any mouse events.  Usually, 
>unplugging the mouse and reconnecting it will solve the problem; 
>sometimes, though, I have to reboot.  Any suggestions on the cause (or 
>a fix)?  
>
>I'm running -current with xorg on new Dell Dimension 8400s, with ITAC 
>Systems Mouse-Traks.

Haven't seen anything like it.  ssh in and check dmesg?

-s