Bug: If a new node is dragged from the sidebar and then below the visible window (scrolling down past any created nodes) and then dragged back up, the cursor will not be able to highlight a drop zone unless it reaches the topmost drop zone.
Update: Dragging the node downwards past the bottom edge of the container by X pixels seems to add an offset of X pixels to the location of a drop zone as seen by the cursor(i.e. placing the cursor X pixels above the desired drop zone will highlight it). This actually only affects the highlighting; drop-zones can still be interacted with as usual. There is a jquery ui bug logged for a very similar issue.
Bug: If a new node is dragged from the sidebar and then below the visible window (scrolling down past any created nodes) and then dragged back up, the cursor will not be able to highlight a drop zone unless it reaches the topmost drop zone.
Update: Dragging the node downwards past the bottom edge of the container by X pixels seems to add an offset of X pixels to the location of a drop zone as seen by the cursor(i.e. placing the cursor X pixels above the desired drop zone will highlight it). This actually only affects the highlighting; drop-zones can still be interacted with as usual. There is a jquery ui bug logged for a very similar issue.