I'm having a Halo: Reach & LIVE related issue, but based on my research I believe that the core of the problem has to do with Xbox LIVE's banned words filter.
My GT is " mr head shot s ". I have had the same gamertag since Halo 2 and have played through the Halo games with it. I created it because my brother and I were really good at SWAT and always got head shots.( hint: mr head shot s ) . I have never had any notices about any other Xbox or Halo violations and everything worked fine until we got Halo Reach . The name was an old favorite profile name and has no bad intentions behind it.
I first encountered this problem over a year ago, whenever I try uploading a file to my fileshare, it says, " the name of the creator is not allowed on xbox live " .Based off of several forums I have visited it seems like the problem lies in the banned words filter on Xbox LIVE. Once again my name has no bad intentions and I do not see how it would be offensive to other people.
I would much appreciate it if someone could help resolve this issue. Thank you.