I have a Samba network with my Linux server as the domain master.  There
are two windows clients on this network, and I control all three from one
terminal, keyboard and mouse with a Belkin OmniCube switch.

I run Linux with Gnome or KDE.  If I switch from Linux to another host on
the network for any length of time, and switch back to Linux, my mouse
will have lost orientation and control, acting erratically.  There is no
response from the keyboard except to do a Ctl-Alt. F2, so I can log in and
shut down gracefully.

Because of this, I have to run Linux command line.  None of my windows
machines get erratic.  My mouse is a Microsoft Intellimouse Explorer,
which seems to work fine with Linux till the cows come home...that is,
until I switch.  I used the Intellimouse ps/2 driver in Red Hat 6.2.  I
also tried another driver, but cannot remember which one.  Had the same
results.
Any help will be appreciated.