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I helped a friend yesterday with this problem. She said that her MacBook Pro just started to double-click items when she single clicked on them in the finder. It did this behavior with other mice, and also with the built-in trackpad. So here is what I did to solve the issue.
- Trashed specific plist’s in the /users/username/library/preferences folder.
- Trashed all plist’s in the users/username/library/preferences folder.
- Trashed all files in the users/username/library/caches folder.
- Reset the PRAM by holding down the keys 3 times
- Reset the SMC
- Tried a terminal command that was something like write -g Delaysomething 1000
- Reinstalled the OS system with the disk that came with the machine. Updated the software configuration.
Nothing that I did helped. She said the machine also had a kernel panic for the first time. According to the research that I did, Apple genius workers solved this issue by swapping out the machine for others. Has anyone else found a solution to this?