Sufficient Permissions error

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   hi,

I have set up my forum at: http://www.legion8.co.uk/nathan/td/tdivforum

I login using my admin login and go to the Forum Admin page.

On the Administer Forums page I see a list of my existing forums  ( currently there are four in two categories)

but when I now click on "Create New forum" button I an getting the message: 

Error

Only members with sufficient permission can access this page.

Can anyone tell me why?
If it did this from the start maybe i could understand but it has let me add a few forums and now blocks me from adding any more.

Please help ASAP.

Regards
Nathan