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After installing the Derby module, I select Tools -> Derby database -> Start Derby server. In the lower right corner of the NetBeans window, a progress bar turns up. When the Derby server has been successfully started, the progress bar stops, but is not removed. Having the NetBeans window repainted (e.g. by minimizing, then maximizing it) clears the progress bar away.
Created attachment 24623 [details] Shows "dangling" progress bar
Not replicated on a Linux system in Netbeans 5.5 beta.
I have never seen this either, so closing as WORKSFORME.