TidyPlates was updated (wowinterface.com) on the 19th. I opened the new pack of files and sure enough he has changed the addon, there is no config.lua. I'm looking for a fix I'll post shortly.

EDIT: Ok well since the old version works fine and I have no idea why he changed it (unless he included a GUI I'll check), for now go under the "archived" tab (wowinterface.com) and download version 4(6/12/09). This is the one I'm using and has the config.lua file. I'll post again when I figure out whats going on with the new version.

Hope this works, let me know if you need anything else.