Drag and Drop between 2 QListWidgets

[ShamusVW]

If I understand, the property "acceptDrops" would determine if items can be dropped onto the QListWidget.
However, on both of the QListWidgets, I have this unchecked, yet can still move items between the two (Windows 7). However, when I move this application to Windows XP, it doesn't allow drops, even if I change both QListWidgets to acceptDrops.
Can someone shed some light on this?

[ShamusVW]

On Windows 7, if I have the right QListWidget dragDropMode set to DragOnly, I can drop to it and drag from it, but not on XP. For this to work on XP, it must be set to DragDrop, which makes sense. It would seem that Windows 7 is letting this slip?