[GeoNetwork-users] GeoNetwork 3.0.4 returns blank pages except when in debug mode?

Can anyone think what could be causing an issue where hardly any of the
pages in a GN install work unless you append ?debug to the end of the urls?

The only error I can see is " ERROR [jeeves] - Error occurred within a
transaction
org.jdom.input.JDOMParseException: Error on line 1: The prefix "gmd" for
element "gmd:CI_ResponsibleParty" is not bound"

though I can't see any problems in the schema folders and GMD is definitely
there.

Can anyone throw some light on this issue?

Cheers

Ian

--
Ian Turton