Recommendations:

Change to an up/down icon when four-way movement isn't possible.

Add a border to indicate draggable items are activated on mouseover.

Comments

Can you post screenshots/mockups ?

I can see how the drag-drop affordances could be made more discoverable but this needs a bit more information and context to discuss properly. Where was this observed? Did people find out about it in the end or not at all?

Status:Active» Closed (duplicate)

Status:Closed (duplicate)» Active

Unmarking duplicate. That other issue was mostly about rewriting to use jQuery UI and didn't include this particular recommendation in any way. This issue is still valid.