I own a Dual 1.25MHz with Mac OS X.2.2. I bought a Logitech MX 700 cordless optical mouse. Great product. I uploaded the last driver. But .... Each 15-20 minutes, It "locks". The arrow is moving onto the screen but no more click ! I must unplug the base cable and then plug it back into the usb port. Them it works until the next time. Any idea ? TIA Alain