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Used patch from issue 21109 with [nb_dev](20020404) / [jdk1.4](fcs) Try to DnD Filesystems node from Explorer to somewhere and after Drop this InvalidDnDOperationException arise (see attachment). After closing exception dialog - DnD continues without problems. It isn't 100% reproducible, I have filed only for Exception.
Created attachment 5311 [details] java.awt.dnd.InvalidDnDOperationException: Drag and drop in progress
Fixed, there is added a check if dnd isn't in progress already.
verified in [nb_dev](20020517)
Resolved for 3.4.x or earlier, no new info since then -> closing.