I had problems with 3.4.1: visual styles. The login page looked different; the fields appeared at left on the page. The window for composing new posts didn't work with HTML formatting.
Later, 3.4.2 arrived and fixed the problems.
Curiously, yesterday I had to set a new blog and those problems came back. Of course it is a 3.4.2 version. A clean installation, no plugins, nothing.
Does the bug still persist? What should we do?