safari 16.3 update not loading Netflix graphics

Hello Andy1or2,

Welcome to Apple Support Communities. 

We understand that Netflix graphics are loading on your Mac. We are happy to help.

Are you using the Netflix app or the Netflix website? Are you using the Safari browser or another browser?

We’d like to have you do some isolating troubleshooting steps. Let’s start by testing in safe mode and then test in a new user account. These steps will help us to isolate the cause.

Use safe mode: How to use safe mode on your Mac - Apple Support

"Apple silicon

1. Shut down your Mac.
2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”
4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac. 
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window."

Set up a new user account: Set up users, guests, and groups on Mac - Apple Support

"Add a user

1. On your Mac, choose Apple menu  > System Preferences, then click Users & Groups .
2. If the lock at the bottom left is locked , click it to unlock the preference pane.
3. Click the Add button  below the list of users.
4. Click the New Account pop-up menu, then choose a type of user.

• Administrator: An administrator can add and manage other users, install apps, and change settings. The new user you create when you first set up your Mac is an administrator. Your Mac can have multiple administrators. You can create new ones, and convert standard users to administrators. Don’t set up automatic login for an administrator. If you do, someone could simply restart your Mac and gain access with administrator privileges. To keep your Mac secure, don’t share administrator names and passwords.
• Standard: Standard users are set up by an administrator. Standard users can install apps and change their own settings, but can’t add other users or change other users’ settings.
• Sharing Only: Sharing-only users can access shared files remotely, but can’t log in to or change settings on the computer. To give the user permission to access your shared files or screen, you may need to change settings in the File Sharing, Screen Sharing, or Remote Management pane of Sharing preferences. See Set up file sharing and Share the screen of another Mac.

1. For more information about the options for each type of user, click the Help button in the lower-left corner of the dialog.
2. Enter a full name for the new user. An account name is generated automatically. To use a different account name, enter it now—you can’t change it later.
3. Enter a password for the user, then enter it again to verify. Enter a password hint to help the user remember their password.
4. Click Create User.
5. Depending on the type of user you create, you can also do any of the following:

• For an administrator, select “Allow user to administer this computer.”
• For an administrator, select “Allow user to reset a password using Apple ID.”
• Use Sharing preferences to specify whether the user can share your files and share your screen.

For information about Apple’s privacy policy, see the Apple Privacy Policy website.

If your Mac or Magic Keyboard has Touch ID, a new user can add a fingerprint after logging in to the Mac."

Let us know if you have further questions.

Take care.

Still not working even after the Safari Update? Seriously Apple?

Looks like Apple supports AVIF format (thumbnails of Netflix are in this format) in macOS Ventura and Safari 16.

https://www.coywolf.news/webdev/safari-supports-avif-in-macos-ventura-and-ios-16/

May be Netflix is sending AVIF images for requests coming from Safari 16.x and not considering that the macOS is also a defining factor in supporting AVIF formats. Netflix should send the thumbnails in other formats instead of AVIF or Apple has to add support for AVIF in Safari and not make it OS dependent.

a temporary workaround is to change the user agent when on the Netflix site:

1) enable the developer menu: Preferences > Advanced > Show Develop menu in menu bar

2) select Develop > User Agent > Microsoft Edge - MacOS

Same issue here, Safari 16.3 does not show any previews on the netflix.com page anymore;

same issue

Looks exactly the same on my MacMini 2018 since Safari 16.3

Firefox works fine.

@green500 - does not solve the issue -