when i launch nexiuz-sdi all seems fine but when i move the mouse, the cursr go to the ceiling, not very good for the gameplay

i run nexiuz on gentoo
kernel : 2.6.16-gentoo-r9
lsusb : Bus 004 Device 002: ID 046d:c506 Logitech, Inc. MX-700 Cordless Mouse Receiver
please help me, this is the first game i run under linux.
thanks