Currently Being ModeratedMay 15, 2013 9:51 AM (in response to paulmcisaac)
I was looking into ways to troubleshoot the issue you describe with the trackpad and found this article named Portables and Magic Trackpad: Jumpy or erratic trackpad operation found here: http://support.apple.com/kb/TS1449. You have already covered the top part of the article about keeping other fingers, and palms away from the track pad, but take a look at this part:
If you have sweaty hands or if moisture collects on the pad, this may also confuse the trackpad. Wiping off the trackpad with a cloth or tissue usually fixes this issue. If the issue goes away when a piece of paper is put between the finger and trackpad you may want to consider purchasing a Teflon applique to fit over the pad to prevent the moisture from having direct contact with the trackpad. Before installing the Teflon applique, confirm the trackpad is clean and dry. You can use a mild glass cleaner sprayed onto the cloth, not onto the trackpad itself to clean the trackpad.
Oil or lotion can also cause the same issue. Do not use hand lotion, or consider purchasing a Teflon pad to protect the trackpad. Before installing the Teflon pad, confirm the trackpad is clean and dry.
Jewelry may also cause interference. Try removing rings or bracelets and see whether the jumpy or erratic behavior disappears.
Apple has had some reports of this behavior related to power supplies made by a third party company. If you are using one of these power adapters, unplug it and try running from the Apple battery to see how the trackpad behaves. Also try using the Apple AC adapter instead of the third-party AC adapter. If the trackpad behaves normally while running from the Apple battery or adapter, there is most likely an issue with your third-party adapter.
Currently Being ModeratedMay 15, 2013 3:29 PM (in response to sterling r)
Thanks, Sterling, it worked. Your solution is embarassing for two reasons. Not only did I read the same article two days ago, I remember having the same problem about 15 years ago with my first Mac laptop. An Apple tech talked me through everything I was doing before asking, "Where exactly are you?" I told her I was about 50 feet from the Srait og Georgia on Canada's West Coast. Well, now I am about 500 hundred feet but the climate has been quite humid.
Nice to know the MacBook Pro works through rain and snow and operator error.
Thanks again for your help.
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