Seems to be a problem with the “Contact Form 7” – Plugin (http://ideasilo.wordpress.com/2007/04/30/contact-form-7/). When I deactivate this plugin, everything works fine again.
As of the compatibility list of CF7, V3.1.2 is compatible with it and worked fine for me in the past.
So although the changes in V3.1.3 are quite small, anything seems to be compete with the CF7-Plugin.
There are no errors or warnings in the debug mode, even the gzopen-problem isn’t mentioned.
But after executing the debug mode theres a new problem. Now it says that the last sitemap generation could not be finished and that I should try to raise the memory limit. But there is no save button any more on the configuration page.
Any ideas???
Thanks for your help!