I downloaded the replacement driver for he SpaceNavigator and got everything to work fine. When I plug in the device, the lights don't turn on, but I can run "simple_af_unix" to make sure everything is working. I get the expected output when I do this. Eventually, if I leave the SpaceNav plugged in for a while, the LEDs turn on by themselves and I stop getting events from the SpaceNav. I'mrunning the driver on a Red Hat linux machine. I checked in /proc/bus/usb/devices and I see the SpaceNav listed with "usbhid" as the driver. When it stops working, the driver is listed as "none." Just wondering if anyone has any suggestions for a fix.