In writing my new CVS Revision Graph plugin, I am unable to get it to work under IntelliJ 6. IntelliJ 7 can use it OK, however, IntelliJ 6 gives me an error when I try to add a Graph2DSelectionListener to my Graph2D. It throws an exception stating it is unable to unwrap the interface a/b/dd or something like that. Investigating a little more, I can see that adding a selection listener to a graph calls GraphBase.unwrap. It must be failing there for some reason. This should not happen since the object I pass in does implement the Graph2DSelectionListener interface.