I don't know when exactly it started but I had Blender open and was switching between it, my web browser and IRC client when I noticed that doing a transform in the 3D view (Move/Rotate/Scale) the mouse cursor would jiggle around and no longer move as it used to just a minute before, although the object being transformed still moves normally so it's no that bad. The problem is that restarting Blender doesn't remove this glitch so there is something in the .blend file that is causing it (opening a new document makes it behave normally again). I have attached the file if someone experienced wants to take a look at it. (Beware that I am a total beginner though so you wont see any impressive modeling or anything).

When I turn off the "Continuous Zoom" preference the mouse cursor behaves normally again but I prefer having it enabled.

Blender version is 2.58.0 r37702.