Fine zoom with scroll wheel does not work

I’m trying to use the Fine Zoom with the Ctrl-Middle Mouse button in 2.66 but when I do that the view seems to pan along the Y axis. When I use Shift-Middle Mouse the veiw pans along the Z-axis. When I use Alt-Middle Mouse the time line frame counter moves.

When I look at the key mappings this seems to make sense. But how do I use the Fine Zoom then?

I think I’ve got it, the scroll wheel shouldn’t be used during fine zooming, it’s just Alt-MMB and then moving the mouse forward or backward to fine zoom.