Scrolling in wrong pane when click-dragging elements in UI editors
When dragging items between panels and holding them near the top or bottom of the list contents window to scroll the list up or down, the source list is the only side which scrolls until the element being dragged is released. For example, pulling an item from the complete list of elements on the left-hand side will only scroll the left-hand list if I'm trying to put the element in a certain place in the right-hand side, and vice versa.
Workaround is simply to drop the desired element anywhere in particular in the list and then adjust it after placing it.
Chrome v26, Firefox v19 and Firefox v20, running on Windows 7