Lee and Brion,
The following URL goes successfully to the desired article: * http://www.wikipedia.org/w/wiki.phtml?title=Insomnia&redirect=no
The "random page" error occurs for me only when I follow a link by clicking on it: * http://www.wikipedia.org/wiki/Insomnia
Maybe this behavior difference of the 2 forms of the same URL will provide a hint of the bug's cause.
Ed Poor