java.lang.RuntimeException: !!! TODO: getInstanceRoot() at org.apache.batik.dom.svg.SVGOMUseElement.getInstanceRoot(Unknown Source)
This is a known deficency.
Reassigning all open bugs to the development list. Sorry for the mass mailing.
Don't know how much impact this has, but I'm working on a project which could use this feature. Is anybody working on it? Thinking about working on it? Dreading working on it?