YouTube doesn't load videos anymore. And site freezes when I try.

MacBook Air | macOS Sequoia 15.8.2 | Safari 27.2

Since YouTube worked perfectly in Safari before the Safari 27.2 update, but continues to work in Chrome, this suggests a Safari-specific compatibility problem.

Rather than repeating the usual suggestions (clearing caches, disabling ad blockers, restarting the router, etc.), let's run a few targeted tests to isolate the problem.

This is the easiest test. Start here.

1. Open Safari.
2. Select File >> New Private Window.
3. Navigate to YouTube.
4. Try playing a video.

What the results tell us:

• YouTube works: Something associated with your normal Safari session may be responsible, such as website data, cookies, or an extension-related setting.
• YouTube still freezes: A normal-session problem becomes less likely.

Private Browsing does not completely isolate Safari from its underlying video playback system, but it's a useful first test.

Start Your MacBook Air in Safe Mode

This is a particularly worthwhile diagnostic test.

Safe Mode starts macOS with a limited set of system components and prevents certain third-party software and startup items from loading.

First, determine which processor your MacBook Air has:

1. Click the Apple menu .
2. Select About This Mac.
3. Look for either Chip (Apple silicon) or Processor (Intel).

Option A: Apple silicon (M1, M2, M3, M4, etc.)

1. Shut down your Mac completely.
2. Press and continue holding the power button until you see Loading startup options.
3. Select your startup disk (usually Macintosh HD).
4. Press and hold the Shift key.
5. While holding Shift, click Continue in Safe Mode.
6. Release the Shift key.
7. Allow your Mac to start and log in. You may need to log in twice.
8. Open Safari and try playing a YouTube video.

Option B: Intel MacBook Air

1. Shut down your Mac completely.
2. Turn on your Mac.
3. Immediately press and hold the Shift key.
4. Keep holding Shift until the login window appears.
5. Log in to your Mac. You may need to log in twice.
6. Open Safari and try playing a YouTube video.

When finished, simply restart your Mac normally to exit Safe Mode.

What the results tell us

• YouTube works in Safe Mode: Something that normally loads during startup may be interfering with Safari.
• YouTube still freezes: A third-party startup conflict becomes less likely, making a Safari/macOS compatibility issue more plausible.

Safe Mode can affect graphics and media performance, so the results aren't absolute proof of a particular cause.

Compare the Results With Chrome

We already know Chrome works, which is useful.

Chrome working while Safari freezes suggests that your internet connection, YouTube account, and the videos themselves are unlikely to be the problem.

Check Other Video Streaming Services

If possible, try Netflix or another streaming service in Safari.

• If other streaming services work, the problem may be specific to YouTube's interaction with Safari.
• If they also fail, that points more strongly toward Safari's underlying video playback system.

A Possible Temporary Workaround: Restart Safari's Media Components

Safari uses separate background processes to handle web content, graphics and video playback. Occasionally, one of these processes may become unresponsive.

You can inspect Safari-related processes using Activity Monitor, although manually terminating them is not a confirmed fix for the YouTube problem.

A safer first attempt:

1. Save any work in your open Safari tabs.
2. Quit Safari completely using Safari >> Quit Safari (or Command-Q).
3. Wait a few seconds.
4. Reopen Safari.
5. Return to YouTube and try playing a video.

This allows Safari to restart its background processes normally.

If Safari continues to freeze: Activity Monitor can help identify an unresponsive Safari-related process, but I would not recommend force-quitting unfamiliar system or media processes as a routine troubleshooting step.

There is currently no confirmed evidence that restarting a particular Safari media process permanently resolves the Safari 27.2 YouTube playback problem.

Is Apple Working on a Fix?

Safari 27.2's release notes include several media-related fixes, including video playback stalling and encoding problems.

However, Apple has not explicitly confirmed that the particular YouTube freezing problem described here has been fixed or that another corrective update is forthcoming.

We should avoid assuming that another update will automatically resolve it.

Nothing wrong with Sequoia or Safari. Does it work with another browser like Firefox? If only Safari then check for ad blocker use and also go to Safari, privacy, manage web data and remove YouTube and test again.

"YouTube doesn't load videos anymore. And site freezes when I try.: Macbook Air / Sequoia 15.8.2 / Safari 27.2: YOUTUBE DOES NOT WORK ANYMORE ever since I updated. Is there going to be a fix? I've waited several days, hoping for a fix. But pfffft. Very frustrating. I fear this kind of thing every time I update."

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Clear your Temporary Internet Files:

A. Clearing the Cookies and History:

1. Go to: History menu
2. Select: Clear History...
3. Select: All History in the dropdown-box
4. Click: Clear History Button

B. Clearing the Caches:

Use my User Tip: How to Empty the Caches in Modern-Day macOS Safari: - User Tip

I'm experiencing exactly the same problem. I've just installed the latest update Sequoia 15.8.3 - it's still the same. I'm still perplexed what is blocking it like that. So far, it's just Youtube. I'm having a progressive web application for Youtube - it does not work as well.

All good on Chrome and Firefox browsers.

It works on Chrome. It worked on Safari too, right up until I installed 27.2.

I have no ad blocker on. And I've followed every other fix suggested to me by every community, by ChatGPT, and by Grok. It still won't play on Safari and literally freezes when I try. Vexing.