Hi, apologies if the thread is wrong, or this has been answered already. I've searched around the fora, but couldn't find anything similar, could be up2 me. As I was installing and trying out some new programs/tools, after a reboot i suddenly noticed that when i tried scrolling down, in ANY window,the scrollbar just automatically starts scrolling back up!! Even when I tried to drag the scrollbar down, it won't stay in place, and the application window starts trembling strangely, you can't read the application when you hold the bar down. I have this issue in every application with a scrollbar, even when I point the mouse to an app with loads of text buffer, i don't even touch the scroller and it starts scrolling up really fast! As it was in every application windows, first I tried to uninstall every app i installed recently, no result, after I did a PV ram reset on boot, nothing. I've been going through the general settings and tried a few scrollbar settings, no changes, and I couldn't find anything related in the systems prefs. I've checked the console log, but no errors that point to any mouse and/or scrolling problem, just one WindowServer error that I couldn't find on google. As a last resort, I created a new user to logon to my system to check if it is a system or profile error, and lo and behold, the scrolling was back to normal in the new profile.... I had somewhat expected this, but that doesn't really solve my problem, I could migrate my old profile to a new one, but then i might migrate the error, starting fresh is also an option, but it's annoying having to reassess all your settings, possibly reviving programs with serials, and stuff you'll never find back ... I really would like to know by now, what ****s up the mouse behaviour so terribly... there must be some .com.apple configuration files one can remove or modify, or defaults.write settings to adjust ? I'll look further in that direction for now, but would be great if any of you has thoughts to share on the issue. Thanks.