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

Bad Request

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 "Beginning of Time" and then check the box below that for "Cookies and other site and plugin data" and then click the "Clear Browsing Data" button.