Gavin,
This will be fixed in the next version.
Here's something you can try (I'm not sure if it will work):
1. visit the new page - mapPreview.do (the generated/ directory should
be populated)
2. copy the generated/ directory to either the WAR file or the exploded
WAR file ("server/geoserver/data/")
This will allow the generated files to be available via http.
dave
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