I'm not sure about what I said about font size but I don't use mobile so it wasn't connected to that.
I will however repeat the comment from the last change to the now old chat:
Another thought for familiarity. The whole feel of PC is kind of Verdana-ish. Maybe use it as a default font in chat instead of Arial? I totally prefer Arial but I also know how poorly people do with change.
Also the default font scales very poorly which is a little tough for us dependent on enlarging the font. I have to say I don't like Verdana per se, but it scales better than the current font (and is also what we are "used to").
Also if my memory doesn't fail me (it does a lot!), the old chat also had a very non compact setup but was changed to a bit narrower. I forgot whom I discussed this with, but we agree the messages are spaced a bit too far away from each other, making it reading unfriendly. I know however, some people DO like an extra empty line between messages so I guess it's a matter of how you see and think.
O yea, I don't know if it's just on my end because something is eating my cookies, but if I set a new skin it reverts back when I log out.
Anyway, most people liked the old new chat better (when it worked), but I must say I have nothing against this one. I actually like it as much as I can like a web based chat. There are a few other things too... but I don't wanna sound neggy, because I'm not.