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build 20070802 Flow Desing > Open a build-impl.xml file > back to flow Desig the Exception shows and the Navigator window for VisualDesigner disappear and is not possible to open again from Toolbar> Window option.
Created attachment 46070 [details] AntNavigatorPanel
Forwarding to the Ant team
Probably a race condition? ant/src/org/apache/tools/ant/module/nodes/AntNavigatorPanel.java 1.8