I successfully used btnx under Fiesty. After upgrade to Gutsy by bottons stops working after I reboot.
When I reconfigure mouse in btnx-config (clean config and configure again) mouse works well.
I tried restarting, stopping service and running as background aplication, "touching" config file and nothing. Xev, and hexing dump from events shows that buttons are recognized but co configured action (for eg. button event) is triggered.