Receiving a Bad Request message when running reports means your computer has too many cookies stored and they need to be cleared.

In order to free up cookie space you should clear your browser cookies. You can do that in Chrome by hitting Ctrl+Shift+Delete then in the popup window (screenshot below), select the first dropdown box as 'the Beginning of Time' and then check the box below for 'Cookies and other site and plugin data' and then click the 'Clear Browsing Data' button.