After upgrade to 3.2, I experience the following problems:
1. On Dashboard, home page, most widgets did not load, admin bar did not load, and screen options & help drop down menus would not work.
I resolved this by adding coding to functions.php in my theme to disable the recent comments widget. (First I disabled all widgets and then restored them one by one to determine which was the problem). So problem is now resolved, but only if I do not use that widget.
2. On the comments page, the screen options & help drop down menus do not respond to cursor clicks. All other functions on the page work as expected.
Disabling all plugins did not help. I do not have a large amount of comments and have no special plugins for comment management installed. I am running Akismet and the Stop Spammer Registrations Plugin to fight comment spam.
3. Admin bar does not display when viewing main web site, even though I have activated that option in my profile.