Comment 9 for bug 823818

Solved. It looks like back when I first added the extension, empty cookies.xml and exceptions.xml files were installed or exported which somehow had no file permissions whatsoever. I deleted those and the error is now gone. Apparently -rw-r--r-- file permissions work much better than ----------; who knew? ;) I am also now certain that it is the Session Manager extension which was exporting cookies/exceptions behind the scenes.