Hi, i've a problem with wordpress 2.5.1 tag system. I have some tags permalink with the underscore, such as "abc_def". When i put the tag on my article, it's transformed automatically in "abc-def", so i lost all links to precedent post tagged with the original one. When i try to change the tag from "abc-def" to "abc_def", or eliminate it, nothing happens, so i have two tags with the same object right now.
How can i do to keep only "abc_def" without wordpress turns it into "abc-def"?