During the Peer Review stage you are asked to review either two pairs of Submissions or one Submission. In the first scenario, you must watch both Submissions in their entirety before you are able to choose a preference and submit your review. In the second scenario, you must watch the entire Submission before you can submit your review. If you do not watch the Submission(s) all the way through, the green button(s) to submit your review will not become active.
Additionally, you can try a hard refresh on your browser as we have found that this improves video playback. Learn how here.