Hi there! It sounds like you're having trouble with the RSBN home page videos on your MacBook Pro with the M1 Pro chip running macOS Sequoia 15.4.1. Let's see if we can get that sorted out.

First, I’d like to ask a couple of questions to better understand the issue:
1. Are you seeing any error messages when you try to play the videos, or do they just not load at all?
2. Have you noticed if this issue is happening with all videos on the RSBN site or just specific ones?

In the meantime, let's start with some basic troubleshooting steps:

1. Restart Your Mac: Sometimes, simply rebooting your Mac can resolve temporary issues. So, give that a try first.

2. Clear Browser Cache: If you're using a web browser, clearing the cache might help:
- Open your browser and go to Preferences.
- Look for a section related to Privacy or Security.
- Find the option to clear your browsing data or cache and select it.

3. Check Browser Updates: Ensure your web browser is up to date. Outdated browsers can sometimes lead to playback issues.

4. Try a Different Browser: If you're using Safari, try accessing RSBN from a different browser like Chrome or Firefox to see if the issue persists.

If you've tried these steps already, or if nothing changes after these steps, we can look into some deeper troubleshooting options. Let me know how it goes!