What steps will reproduce the problem?
1. Attempt to drag something not prospectable to another slot.
2. Attempt to drag a piece of prospectable ore to another slot.

What is the expected output? What do you see instead?
For step 1, the item will drag to the other slot, as normal.
For step 2, the item will not drag unless the mouse is again clicked.  On rare occasion it will work, but it will reliably not work at all, causing a disconnect with the rest of the game's flow.

What version of the product are you using?
v201102241718

Do you have an error log of what happened?
Not Applicable

Please provide any additional information below.
When the mouse is hovered over any item that can be prospected, there is also no selection border that tells the user that the mouse is over the item.  This could be related or a possible cause of the above issue.
This has not been tested on other items affected by this addon, such as herbs.