hi, I just want to say that I already checked the macrumors forum and the multicluch forum, so you really are my last resort. I just updated to 1.6.3 , a few other updates, and multiclutch. now, every time I try to scroll while using my trackpad, the appllication I'm using stops responding.( firefox, chrome, itunes, pages...) . It doesn't happen in safari and mail. I think the problem is multicluch. I allready removed the prefpane in the prefpane folder. is there something else I can do? thanks for your help.