MyBB Community Forums

I need my moderators to be able to add new categories to ezGallery.
I have the moderators group permissions to 'Admin' the gallery and they now see the admin links under the gallery page, when they select to add a category they need to re login, but it doesn't accept their forum username and pw, even though it's correct.

I cannot see any other options to set. Where am I going wrong?

Thanks

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Nobody? This is really important, surely others have come up against this?