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We’re very sorry for this experience, we understand that situations like this can be very frustrating!
Please note that for issues with creating and presenting Prezi Classic presentation, we have this forum where we try to give advice and find solutions.
As for Prezi Next, our Live Prezi feature provides a much smoother experience. We’d like to encourage you to give a try to Prezi Next and create your presentations on our new platform going forward because this is the version we will continue building with new ideas and features.