This is from the blue sticky at the top of the forums regarding the new patch tomorrow and updates:
" The lua API has been modified to prevent some addons from using communications channels in ways that are contrary to the spirit of the game."
I’m not sure which add-ons this will effect. I don’t think I use any that use these functions.
Edit: If you click on the “modified” link in the quote I posted, it goes into more detail explaining what will be broken and what will work.