Thus any tags that you may have with a / in them won't work; clicking on them will just take you off to an error page - you'll see Frank!
LJ are 'working on this' but at the moment do not have an estimated time frame for when it might be fixed :-(
Like many people I have a lot of tags with / in them here on my personal LJ and also on my various communities. And it's not just people with pairings who are irked, many folk use the / for non-pairing things.
At least it's being fixed - the thought of having to change tags here and on comms was a nightmare - I just wish there was some hint of a time frame.