It works fine if plugged directly to the computer, no unplug/replug necessary.
At one time, I did have the mouse plugged into the USB hub andworking normally.
I previously had a serial mouse. Then i got the USB mouse.
Originally, i just plugged the USB mouse into the hub, while still leaving the serial mouse plugged in because xwin would lock up without the serial mouse.
At some point, i finally got kudzu to remove the serial mouse and install the USB mouse, but after that this problem showed up.
RH9, kernel 2.4.20-8
alias parport_lowlevel parport_pc
alias eth0 sis900
alias usb-controller usb-ohci
alias usb-controller1 ehci-hcd
alias usb-controller2 usb-uhci
alias char-major-195 nvidia
alias eth1 8139too
alias sound-slot-0 i810_audio
post-install sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :