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Created attachment 128799 [details] Excerpt from messages.log Tested using NetBeans 7.3B2; tested using SwingX 1.6.4. At any time after a JXTaskPaneContainer is added to a GUI Builder form: -If you try to save the form with Ctrl+S or a similar gesture: --The status bar at the bottom of the IDE window claims the form is saved. --The file name in the tab for the form is still bold, implying that the form is not saved. --Looking at the file on the drive, the form was not saved, contrary to the message in the status bar. -If you choose to close the form, you are prompted if you want to save. --If you choose to save the form when prompted, an exception is displayed. --The discard and cancel buttons of the save form prompt work as expected. Reproduction steps: -Create a new form. -Drag a JXTaskPaneContainer into the form. -Try to save the form. Expected behavior: At the least, the status bar shouldn't claim the form was saved when it wasn't. Preferably, an error message would appear when NetBeans couldn't save the form for whatever reason at any time. Ideally, NetBeans would properly save the form. messages.log excerpts attached.
I think this was fixed just recently as part of: http://hg.netbeans.org/jet-main/rev/1196c3966367 The fix did not make it to beta 2. You can try the latest daily build to verify.