Don't fret. We've got you covered! If you click the Sign in with Google button, then authorize, then click Continue to Dashboard and are met with the Sign in with Google button again, you're in a loop. It's actually very simple to solve. You probably have cookies disabled. Follow these instructions to get the sidebar to appear:
Note: if you have ticked Block third-party cookies, then click on Allow then add contactmonkey.com to the list then Add.
Now go through the Sign In with Google process again, and your sidebar should appear!