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If you are using windows and firefox, do it by holding down CTRL and hitting F5. Both of the pages you are having problems with use ajax (therefore javascript) to make requests in Vanilla. If you are using old javascript files (cached by your browser) the necessary information won't get to the ajax page properly.
These are upgrade problems. Once you get through them, you won't really see this problem anymore.
I would suggest throwing up the old version just to give your users a working environment and re-uploading the latest version in a different folder to get your bug mashed out--once that is done you can delete the old one and rename the new folder (remembering to update your conf/settings.php file paths to match)