I am having a problem with the most basic possible thing: the middle mouse button will only rotate the view sometimes. If I left-click somewhere (on or off an object), sometimes it stops working. My mouse is a Microsoft 5-button, with tilt wheel.
I am a completely novice Blender user. Clean install, factory settings, mouse works in every other application.
I left-click in the 3D view, which moves the red-and-white reticle/crosshairs. Then I try to use the middle mouse button to rotate the view. Sometimes it works, but sometimes nothing happens (though the scroll wheel always zooms reliably.) If I keep clicking and re-clicking the middle mouse button, eventually Blender will decide to rotate the view, but it's not a certainty.
Once it permits the view to rotate, the situation is stable until I left-click somewhere again. Where in the view I click (for both left and middle buttons) seems to have no effect on the problem.
Because the problem seems to appear completely at random and is so transient, it looks to me like a bug. If it's not, I have no idea how to tell it from normal Blender behavior. I've tried using Emulate Three Button Mouse, but the problem seems to occur for alt-left mouse button as well, so I know it's not my middle mouse button.