If you use this mod, and pretty much everyone does, be sure you update to the latest version. Since version 1.54 anything older is no longer supported. Blizzard introduced whats known as "hidden channels" for these types of mods in 1.12 to utilize and so the old stuff isnt compatible.
You can get the latest here off our downloads: http://www.twilightonalex.com/index.php?option=com_docman&task=doc_details&Itemid=&gid=1