I've been building up custom patchbanks making use of some of factory & some personal patches, I normally just open the source patch bank in the top window & drag the required patch to the custom bank in the bottom browser window - no problem.
This morning, when I've selected a category instead of a specific bank & tried dragging a patch, once I drop it in the bottom window the top window changes & to get it back to the previous window I have to select another category then reselect the one I want.
This isn't a problem as such & it might even be expected behaviour depending on how patches get catalogued but after a while it gets boring, especially if for example you're on page 4 of leads then after dragging a patch to the bottom window you have to select a new category then reselect leads & scroll back to page 4 again - that's far too many button presses.