Well, I’ve finally got my blog back up. It seems that there’s some kind of bug (impossible to trigger in the default configuration, I’d assume) in the newest version of PHP 5 which causes ./ and ../ includes to fail, and which doesn’t play nice with apache’s DirectoryIndex-based redirection. (the feature that lets www.foo.com load www.foo.com/index.html) WordPress makes use of such things in several important places.
I’ve managed to work around that by using symlinks for the ../ includes and by removing the ./ or ../ wherever I found it, but I don’t know what the security implications of such a change are and the post preview window doesn’t work correctly now.
Any input on the problem and what I did to work around it would be greatly appreciated. Also, if you find any features which are still broken, please let me know so I can add the workaround there too. Finally, if you know how to fix it properly, please let me know so I can forward your message to my webhost.

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