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061220, unreproducible, after trying to switch project group. There's a lot going on here, but I think one problem is that PropertySheet$SheetPCListener.propertyChange, called in response to a method in Nodes API (Node.fireNameChange) which does not document any threading restrictions, attempts to grab the AWT hierarchy lock even when not in EQ. The deadlock then arises since the AWT hierarchy lock is being held (correctly) by EQ, which cannot proceed because it is waiting (legitimately) for Children.MUTEX, which is being held (I think legitimately) by another thread waiting for ProjectManager.mutex, which is being held (again legitimately) by the thread firing the name change.
Created attachment 36857 [details] Thread dump
The prop sheet is accessing (or trying to) AWT components from other thread.
i wasn't able to reproduce but i've made sure the appropriate part of propertyChangeListener runs in EDT only