Split window view is too much trouble when the conversations are sparsely inconsistent.
This is why my Skype is one window all the time. There are times when it kicks up and I need to be chatting with a lot of people, but usually there's no real benefit for me.
Wahah, I see myself in that screenshot!
I think I would care a little less about the new Skype's problems if it didn't have so many space-wasters. Why the pictures in chat? I can tell who's who without them, but when I had a newer version of Skype, I couldn't disable them. And those massive ad spaces, ay...