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I do not know if this is possible, but any time you select or apply a new style the style information is removed. This irritating if you want to make slight changes to the existing style layer. Also if the a user loads a layer with an already defined style (saved sld or not saved sld) symbolizer loads the preview layers, but not the information to make that style.
I need more details on this, I can't reproduce it.
I think this is also fixed by the javascript fix in bug 203