We expect a fix for this issue Tuesday, February 9th.
We are aware of an issue where videos will not play properly in browsers other than Safari.
This appears to only affect video shot in the Slatable selfie camera or imported video shot in Apple's High Efficiency format.
1. Please save the Takes shot in the selfie camera to Photos and import them to a new audition.
2. If importing Takes goto Settings > Camera > Formats and choose Most Compatible.
3. Turn off Mirror Front Camera.