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After checking the double-click speed using the article below, I'd start by seeing if the issue persists when booted into Safe mode or in a new user account:
Magic Trackpad and Magic Mouse: How to adjust double-click and scrolling speed in Lion
Mac OS X: Starting up in Safe Mode
OS X Lion: Create a new user account
All the best,
Wow that was an obscure location to fix this problem but it worked. My OS X menu is different, it is labled accessibility vs universal and the options are a bit different. Reducing the speed of double click did the trick.
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