We have developed a new, simplified UI for CrowdGrader, and we are in the process of gradually rolling it out to all users. The new UI gives you a single list of all assignments in which you are participating, right at the home page, for maximum convenience. That list acts as a global control panel: from that list, you can easily see where you have to submit, and where you have instead to review.
We hope this new UI will make CrowdGrader simpler and faster to use! We would love to hear any feedback.