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A couple of other things I forgot to mention – have deleted the nextgen gallery plugin and reinstalled a fresh copy, and reinstalled the latest WordPress version, the plugin still won’t work.

Thanks.

This has now been resolved thanks to some fantastic support from the NextGen guys, I’m posting the fix below to help anyone else who might have the same problem caused by the same thing.

The issue was in the wp-config file – I’d recommend making a backup copy of the original before doing this in case you need to put it back.

There were a couple of instances of “define” lines being added to the site, these were:

‘WP_HOME’ and ‘WP_SITEURL’ – there were strangely 2 of each, I simply deleted them all.

Secondly was the line:

define(‘WP_CONTENT_URL’, ‘/wp-content’);

The wp-content bit should be the full path – e.g. http://yoursite.com/wp-content

Sorted those out and the problem is gone, it’s also sorted out another issue of the general settings, etc sections of nextgen being blank pages.

Good luck, I hope it works for you too.