Regarding the @ mentions, you may have to click the option in the little menu that loads as you're typing so that it knows which user you are trying to mention. I think someone else may have already suggested this. For example, if I type in @Marwood & I and never click the menu option, it might not be treated as a mention. Which kind of makes sense, because what if there was also a user named "Marwood"... how would it know that I wasn't trying to mention him instead of you? But if