I created a custom bbcode which works just fine. However, I decided to change it from uppercase to lowercase (I know, doesn't really matter, but I thought I would go ahead and mention it here anyway) and when I try to save the change I get the error "The BBCode tag name that you selected already exists." and the change is not saved. Not sure why I get this error since I am not trying to create a new bbcode, just edit an existing one (using the edit button next to it in the ACP).