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Problem solved! And a silly cause, too. I use a second monitor at work, connected through a KVM switch. When connected to the external monitor I also get the other mouse. It was under some books (since I never use it, I'd even forgotten it was there) in my messy office, and the right button...

Hey, just read about your mouse problems. Having same (or really similar) problems here. If you get a solution, please let me know!

I'm having the same problem here. It started recently; I'm running a MacBook Pro, but the problem seems unrelated to an external mouse. Occasionally I get an outline as if I'm dragging something in Firefox or Thunderbird, and I can't get rid of this except for killing these applications. This...