Hi there,
I have exactly the same problem as in this old thread:
http://www.wowinterface.com/forums/s...d.php?p=253720
I tried it with the alpha of the tabs but that didn't change anything.
This only affects the "general" tab the other tabs are fine and only the last 3 lines.
edit: seems to be a problem with rChat, PhanxChat works fine.