I just noticed something today and made a possible connection. I'm not sure if it's just me or not but when I try to preview a message before posting it it gives me this tiny little box that barely displays one line of text, which I have to scroll through to see everything line by line. I'm not 100% sure but I think the theme might be responsible for this problem.
Umm... what browser are you using, Xi? Because I preview my messages all the time and I've never had that problem before. =/