I have had this issue a number of times and it is getting more than a bit annoying. System: FC5 - have updated everything within the last couple of weeks with yum. I am working along ... at some point the system seems to lock up - after a fashion. I can still move the mouse and the arrow is moving around ... the color of the mouse changes indicating I can move it across windows and that is detected ... but ... I can not select any of the windows open on the screen. It is like the mouse button feature is gone. I eventually get annoyed ... reset X via ctl-alt-backspace to kill X, relog in and then everything is fine. Thoughts? Suggestions? Thanks in advance. Randy