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Created attachment 133530 [details] Screenshot of the problem When I install the CodenameOne plugin, my "Source packages" and "Libraries" nodes are duplicated. It happens after install. Restarting NetBeans solves the problem. => Could you configure your plugin to enable the "Need Restart on Install" feature ? Thx. It happens on every version of NetBeans, JDK6 and 7, on Windows XP and Seven.
Odd, we didn't see this. I'll fix it for the next update thanks.