Problem displaying videos in Storyline

Hello everyone,
Since the last update, I've had a problem with the display of videos in my Storyline. When a video is added, it appears with a uniform color (see photo), and this doesn't change even if I move forward in the timeline.

The problem is that I have to preview each time to check t

hat my elements (such as squares, rectangles, etc.) are correctly positioned, which is quite restrictive. I've compared it with other users who don't have this problem, so I'm guessing it's due to a specific setting I've made.

Do you have any idea which setting might be to blame?
Thanks in advance for your help!