can't create pages or posts

Hello,

I run a multisite installation with 8 sub-sites. On just one of them I can’t create pages nor posts. All the other sub-sites work just fine. No error messages. Upon creating both a page and a post it returns an (empty) list with the posts without having created anything. Other than that I can’t access ‘All pages’.

I tried loading another theme, I de-activated all plugins (both network and sub-site plugins) and I tried using different systems (laptop, ipad) and browsers (safari, opera, chrome).

It doesn’t resolve my problem. Anyone any idea how to take this further?

Thanks in advance