Here's a problem I haven't been able to find any advice on. When I am certain websites - i.e. YouTube - and I leave my computer for a few minutes, I come back to find the web page fading in and out, so that the screen looks like it is flashing. I am assuming that what I am seeing is the screensaver unsuccessfully launching, and then the web page reappearing (after about half a second). Now, I have the latest update version of the Mac OS and I have one the Apple screensavers set up. I am assuming that this is a software issue (hence why I am posting in this forum), and is related to some program running in the background on certain sites that prevents the screen saver running (is this even possible?). Although I haven't checked, I believe that this problem usually occurs in Mozilla, if that has anything to do with it. Anyway, if anyone else has had this problem, or knows about it, I would love to hear from you. Thanks. 