On IE9 when dragging over a valid drop component the pointer shows a disallowed sign.
If the user ignores the pointer and continues with the drop operation it is successful so this is a visual problem rather than functional.
I have tried various combinations of components and it seems like all drag and drop operations are affected.
IE8 and other browsers (e.g. Firefox, Chrome, Safari) do not have this problem.
I raised SR 3-6588048471 and Oracle development responded that this is a bug in IE. ADF is setting the pointer correctly but IE is overriding it. They have raised a bug with Microsoft.
Oracle bug 16035752 is tracking the issue.