Arduino kills mouse in Fedora 12

Every time I plug in the arduino I lose mouse control after 5-10 seconds, this happens if I'm using USB or external power source, has anyone else had this problem? It did not happen in F11, I have to reboot to regain mouse control.

Also posting this on Fedora Forums, but checking here first.

It sounds like the operating system is interpreting the Arduino as a mouse. Do you know what program it's running? Try uploading something that doesn't send serial data to the computer.