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The user can easily start the import a second time while another one is already running since the action buttons of the Import Plugin stay active after clicking Import. The action buttons should be disabled until the plugin installer is running. That is point 4 in Issue 163051 http://www.netbeans.org/issues/show_bug.cgi?id=163051
Georg, I`ve tried to reproduce the issue and I totally failed. Why I click on Import button is becomes pressed and clicking on other buttons has no effect - they are not handled. Clicking the second time (with it is already been pressed) on Import does not work either. So if you have steps to reproduce (and screenshot) when 2 dialogs are shown - please reopen the issue and provide them. Thanks, Dmitry