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In my 2 PC´s, when I add a JInternalFrame in a JDesktopPane using the palete, the guibuilder don´t place the component and show a message. See the figure.
Created attachment 40100 [details] The Error
I am unable to reproduce this issue in NB 200804290002 (DEV). Could you please provide some additional information and more detailed steps to reproduce (or could you attach the form files causing this issue)? I am closing this issue as WORKSFORME for now, but feel free to reopen this issue if it still persists.