To obtain the desired effect, one has to drop the item close enough to the ghost. Then the item pops in place of its ghost. The only visible difference with the undesirable behavior (expected the result after a full page reload) is that the mini AJAX animated GIF doesn't display.

When one is dragging a resource, a "ghost" of the resource follows the pointer, indicating (I guess) where the resource would be moved to if the user releases the mouse button. However, if one releases the mouse button when the item (hooked to the mouse pointer) is too far from its ghost, the item pops into position where the ghost was, but the resource is not actually moved (as proved by a page reload).

To reproduce this:

• click and hold the resource handle to initiate the item move
• holding the mouse button, move the resource around and observe the following ghost : the item hooked to the mouse moves with the mouse, whereas the ghost only pops in possible destinations
• if the mouse button is released when the hooked item is too far from the ghost, the item pops in place where the ghost was, but is not actually moved.