bug in 3.5 beta media insert?

Hi I am trying to insert image into post from post editor using beta media of wp 3.5 beta but it simply doesn’t work. I choose images then press insert into post button at the top right corner but it doesn’t insert any image into post. I tried many times but it doesn’t work.

I did upgrade from 3.4.2 into 3.5 beta today.
I want to mention that I haven’t any post editor advanced plugin installed. just basic installation.