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I always keep 'Tap to click' off because I like the physical feedback when clicking and I tend to automatically touch the trackpad.
I reinstalled Mavericks last week, because I wanted to start completely fresh.
Now my trackpad automatically 'clicks' often. Sometimes I just move the mouse, and it will drag things, making it super annoying to use the mouse.
Is this a known problem, and is there a solution? I'm post-applecare so I hope I don't have to bring it in to get it repaired.
This sounds like either a faulty trackpad or possibly a swollen battery. I know the battery suggestion sounds strange but the reasoning is that as a battery swells it puts pressure on the components behind it, which for most of Apple's portables includes the trackpad. Basically it could be slightly pushing on the back of the trackpad at all times, causing even minor touches to register as a click.
The only way to check for this is to remove the bottom case, which you may or may not be comfortable doing. iFixit has a guide for replacing the battery that shows the steps to remove the bottom case and provides a reference for what a healthy battery should look like. If the battery is not swollen then the other likely hardware fault is the trackpad, which isn't common but isn't all that uncommon either.
Before you tear into your Mac though you can at least rule out software as the culprit. You can boot to your recovery partition by performing the following:
Once you're booted to the recovery partition you can test your trackpad but clicking/not clicking on items. If the issue persists then it's likely one of the hardware faults I outlined above.
Hope that helps!
