Is there a bug in Webflow causing background videos to only display the first frame as a still image, even though no changes have been made to the projects?

I'm not aware of any specific bug in Webflow causing background videos to only display the first frame as a still image. However, there could be several reasons why this issue might be occurring in your specific case. Let me share some common factors to consider and potential solutions:

1. Video Format: Ensure that your video file is in a supported format like MP4, WebM, or Ogg. Different browsers have varying support for video formats, so it's essential to provide multiple formats to maximize compatibility.

2. File Size and Compression: Large video files can cause performance issues and may result in the first frame being displayed as a still image. It's recommended to compress your videos using tools like Handbrake or Adobe Media Encoder to reduce file size while maintaining quality.

3. Internet Connection: Slow or unstable internet connections can interrupt video loading, resulting in only the first frame being displayed. Test your website on different internet connections and devices to rule out this possibility.

4. Video Loading and Autoplay: Check if you have enabled the "Autoplay" setting for your background video. Some browsers restrict autoplaying videos due to user experience and resource consumption concerns.

5. Browser Compatibility: Different browsers handle video playback differently. Test your website in multiple browsers (Chrome, Firefox, Safari, etc.) to identify if the issue is browser-specific. In some cases, adjusting video settings or using fallback options like image backgrounds for unsupported browsers can be a workaround.

6. Webflow Project Settings: Double-check your project settings within Webflow, particularly those related to video backgrounds. Make sure there aren't any conflicting settings that might be causing the issue.

7. Webflow Support: If you've gone through the above steps and the issue persists, I recommend reaching out to the Webflow support team. They have access to the latest information and can provide more specific guidance regarding video background issues.

Please note that Webflow may have released updates or new features that could affect the behavior of video backgrounds since the time of writing this response. It's always a good idea to consult Webflow's official documentation or community forums for the most up-to-date information.