I posted this a few minutes ago in "Troubleshooting" but as I think it's a code error or bug I'd like to point a link to my Problem.
Summary: At one (to me unknown) part of the code the functions.php seems to refer to "class-IXR.php" in the wp-includes folder. The referring link uses uppercase letters which displays an error message in my Opera browser (Posted in the other entry). My files are all renamed to lowercase due to my FTP clients habit of doing so (which imho is totally normal behaviour and known amongst coders so that all -thought through- links are done in lowercase).
Someone would have to replace the section of the code with the lowercase letters class-ixr.php instead of class-IXR.php
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