Zoom not refreshing properly

I’m using Blender 2.69 and I have a Logitech G400 (if that helps).

The problem is that I scroll up or down with the wheel, but the view doesn’t zoom in or out until I move the cursor. When I move it, the view refreshes instantly with as many scrolls as I did either way.

I searched the forum but I couldn’t find anything, except for the zooming problem everyone has when you get too close to a model.

Every little help is appreciated!