Sometimes the 3d view rotation using the 3rd mouse button starts to rotate around an unusual point that is not very convenient. I don't know why it starts doing this, but it usually starts when I'm zoomed in on a detailed part of a model and persists even after I zoomed out.
I've tried changing the rotation style back and forth from trackball and turntable. I've tried restarting Blender, but that doesn't really help. My main solution to this problem has been to abandon working on the projects that this happens too, which only works because I've been lucky enough to have this happen only on projects that can be abandoned.
Is this changing of the view rotation a common occurence? Is there a way to reset the center of rotation for the 3d view?