I have a document based app that has a source list (NSOutlineView) that allows 
drag and drop on itself or another source list (same class) in a different 
document in the same application.

Everything works on 10.6, in 10.7 drags to the same NSOutlineView are validated 
as I expect. Drags to the other source list in a different document (different 
window) are momentarily validated but then immediately invalidated. I can 
confirm that 

- (NSDragOperation)outlineView:(NSOutlineView*)outlineView validateDrop:(id 
<NSDraggingInfo>)info proposedItem:(id)item proposedChildIndex:(NSInteger)index

is returning the correct operation (copy), but for some reason it doesn't 
stick. Is there some side effect of the new dragging sessions that might be 
causing this? I don't see any other delegate methods that would interfere with 
the drag operation like this.

--
Michael_______________________________________________

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