Thelgord Posted September 26, 2009 Share Posted September 26, 2009 I use a USB mouse and k/b on my system. When using ITunes or Quicktime it would cause the mouse skip horribly. The fixes listed on this board all said I should downgrade my versions of each. That was unacceptable so I fired google and starting searching. I found one reference to AppleUpstreamUserClient.kext while searching so I removed it and rebooted. I am not sure what this kext is for but it seems to have completely solved the problem. I am not saying this is a garunteed fix, but it may help someone else that is having the same issue. Remember to backup any changes and have way to restore your system should any changes make your system unstable (Thats just good advice no matter what your trying to do ) Link to comment https://www.insanelymac.com/forum/topic/189051-fixed-mouse-skipping/ Share on other sites More sharing options...
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