The Cyborg/Mad Catz R.A.T.7 and M.M.O.7 mice have an unresponsive button issue when used with Linux. If /etc/X11/xorg.conf is not modified, the buttons on these mice will become unresponsive after a while. X must be restarted for the buttons to work again. This usually means logging out and then logging back in or pressing CTRL + ALT + Backspace or using any of the many other methods. However, restarting X closes all windows, which is usually annoying when in the middle of doing something important. This can be tricky to fix upon a new Linux installation or when the buttons lock up due to an incorrect section in xorg.conf.
One quick way to restore the buttons per session is to switch virtual terminals. In Linux Mint 15 with the Cinnamon desktop, press CTRL + ALT + F1, and, after seeing the login prompt (there is no need to log in), press CTRL + ALT + F8 to restore the graphics mode. The mouse buttons function again, and all windows are restored so you do not lose your progress.
Keep in mind that this is only a temporary solution. xorg.conf must still be modified to correct the buttons permanently.