Hi all I bought a MBP last week, and today I started experiencing problems with the mouse cursor. No matter whether I'm using the trackpad or an external mouse (I've tried using both a wired Mighty Mouse and a wireless Logitech), when I'm moving the cursor it keeps freezing for a few seconds (perhaps less than a second), and then I "regain" control of it, only for it to freeze again after a short while. The only thing that I can think of that might have something to do with this is that I replaced the 2GB of Apple RAM with 4GB of OWC RAM a couple of days ago. Can this be the reason? Please help me, as this problem renders the computer impossible to use Thanks in advance Daniel EDIT: I forgot to say I'm running Mac OS 10.5.1 and I've got the Keyboard Freeze Update Installed.