Windows XP SP2 PM 4.4.3.2 with navigator window displayed and a folder tree expanded, favourites hidden and contact sheet displayed.
When I "try" to drag'n'drop from a displayed sub-folder to ANY other sub-folder, the Navigator tree structure collapses and I am not allowed to drop is anywhere. ANY movement in the mouse casues the tree to collapse.
This same functionality worked like a charm in 4.4.3.1.