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The "views_gallery.info file has:
dependencies[] = "nodereference_url"
instead of:
dependencies[] = "node_reference_url" --- NOTE THE UNDERSCORE.
which will indicate that the Node Reference module is "missing" even though it is not. This keeps
the checkbox greyed out for the views_gallery module, so it can't be enabled.
It is this way in the 6.x-1.3 version too.