I've been running about a dozen WP installs, and never had this problem before:
I installed a brand new instance of WP 3.2.1 and the WYSIWYG editor does not appear in post or page editing/adding. The Visual tab is there, but when I click on it I just see a plain text screen. If I add HTML code in the HTML tab, the Visual tab shows the same code (the two screens are identical).
A couple other blibs that may or may not be important:
For this install, I had to go in and change the permissions for the directories before the initial install would run (with the same host, in the past, the new directories already had the permissions). I have changed the permissions for my directories in wp-admin and wp-content to 755.
I noticed that all my .js files are 644. I also noticed all the directories in wp-includes are 700.
Any help in figuring out what's wrong?