Just upgraded, everything went well. However, my Piwik home page has the word 'Array +' next to the date at the top. If I click the date it brings up the calendar. If I click Array it expands into multiple Arrays each pointing to a report with a period of day, week, or year.
Also, the alert message box in the top right-hand corner now has "General_PiwikIsACollaborativeProject" in it and nothing else.
uh no, translation strings that don't load is more likely an indication that your installation isn't well.
You should install to a fresh dir, recreate the tmp folder and copy your config.ini.php (or let piwik recreate it).