Just testin with Chrome... Nope, works fine for me. I can see my post in preview and I've got a normal window to keep editing my post...
Whoops, hang on, I see what you mean now. That IS crappy!
Lessee now, I'll edit with IE7. Mmmm... much better. Wonder what Safari does? Ummm... Yech! Same as Chrome but without the scroll bars!
So, as far as I can see it only works in IE. Anyone tried Firefox?