Thanks Jashan, your solution fixed my issue, much appreciated.
Yes, still an issue – it is really strange. I didn’t set up the original site, but did upgrade from version 2.7 in September. The plugin was installed prior to the upgrade, but I can’t confirm if the problem existed with the pre-upgrade site. The original site used the Twenty-Ten theme, but was heavily customised by the developer. The current site has no custom code, but uses a theme from Cyberchimps. Appreciate any thoughts you may have, or happy to give you access to look around if that would be useful