Panning broken when zooming in?

In V4.1 (Windows), panning the view by holding the middle mouse/scroll wheel no longer works after double-clicking on a mesh to change the center of rotation. Panning works before double-clicking. This is a regression from V4.0 (Windows).

I looked at this behavior more and have a correction and clarification. The behavior is the same in 4.0 and 4.1. The pan behavior appears to be scaled by the zoom level, so after double-clicking to focus/zoom a couple times, the pan scaling is effectively zero. That is the real