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NetBeans IDE Dev (Build 200702281900) 1.6.0_01; Java HotSpot(TM) Client VM 1.6.0_01-b04 Linux version 2.6.17-11-generic running on i386 en_US (nb); UTF-8 Ubuntu 6.10, default theme setting. See attached screenshot. In Metal theme are column headers OK.
Created attachment 39092 [details] screen shot of update center wizard - step 4
The Autoupdate UI was removed in NB6/M9, new Plugin Manager is a facility to install new or update installed plugins.