Hi I just updated to the latest SVN 536, and I noticed that I am unable to add widgets. The text is clickable, but does nothing. I remember it used to be a dialog popup of sorts. I am also getting this error with one of the widgets. "*Fatal error*: Class 'Piwik_Period_Range' not found in */var/www/XXX/piwik/modules/Controller.php* on line *162" *