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Just a black square

Symptoms

In the Proctor’s Room during a live-review exam, the proctor sees just a black square instead of the learner’s video feed.

The problem is shown in the screenshot below.
ProctorViewBlackScreen

Cause

An unexpected error occurred.

Resolution

Ask the proctor to try refreshing the page.

If refreshing the page does not help, refer to this article for further troubleshooting.