Similar problem, visual editor does not appear after upgrade from wp 2.3.1 to 2.3.2. It worked without problems on the same server configuration with wp 2.3.1.
Of course, visual editing is enabled. To be totally sure, I uploaded the tar to the server, extracted it there, deleted the old installation and copied the 2.3.2 files. But it does not help.
The tabs "visual" and "code" do appear, but no wysiwyg editor in them. It is a simple textarea, and without the controls from the code editor. The problem do occur with the browsers Epiphany and Opera in the newest version.
I could not test it with MS Internet Explorer, because there is no linux version of the IE. Epiphany uses the same engine as Mozilla, but in another GUI.
I'm sure that it is a bug. It may occur only under strange conditions on the server. If anyone else get the same problem, we should check our webserver's configurations to find the reason for this problem.