We are upgrading to the latest version many problems with WP 3.0.1 site that I manage. Thus, the list of users are not shown (white screen) when activating plugins plug-framing appears not (white screen) or what to think you can not return from html to wysiwyg window ? Quite a disaster in the screen that you dashoboard the date of an item can not change
In short apron has a lot to the new version which is said that all bugs are gone. I have tried everything to get those white screens to connect (plug-ins upgrading etc etc) but nothing helped.
I personally think that the WP team just rushed the new release in delivered, thereby causing much extra hassle for website administrators.