Hey Milan,
Thanks for reaching out to the community, and sorry for the trouble!
Is is happening on browser, desktop app or both?
In order to troubleshoot, can you try these following steps:
Check to see if the prototype is rendered correctly in other browsers?
Visit this site https://get.webgl.org/ and confirm if you see the spinning cube? If not, please follow the troubleshooting instructions on the page
Can you make sure your graphics card drivers are up to date on their corresponding sites?
Can you also try clearing your cache on both the browser and desktop app see if that helps (instructions below)?
Here’s how to clear the desktop app cache on Windows:
Close the Figma desktop app
Open the Start menu, and paste in this, followed by enter: %APPDATA%\Figma
In the window that opens, delete the Desktop and DesktopProfile folders if they exist
Launch the desktop app again
On Mac, use the Terminal app to clear the cache.
Quit the Figma desktop app.
Open the Terminal.app and enter the following command: rm -rf "$HOME/Library/Application Support/Figma/"{Desktop,DesktopProfile}
Try opening the Figma desktop app again.
If the issue still persists, feel free to share a copy of your file to the support team so we can try to replicate it here.
Be sure to use your Figma account email, include a link to the file, and share it with support-share@figma.com, so we can take a closer look. Thank you!