Hi there! Let's try to get your MotoGP live stream working when you're signed in. It seems like a common issue could be due to account credentials or browser settings. Let's work through a few steps to troubleshoot this:

1. Check Login Credentials: Ensure you're using the correct email and password for your MotoGP account. It's always a good idea to double-check the credentials if you're experiencing issues.

2. Clear Browser Cache: Sometimes, old data in your browser might cause issues. Here’s how to clear the cache on your Mac:
- Open Safari.
- Click on "Safari" in the top menu.
- Select "Preferences."
- Go to the "Privacy" tab and click "Manage Website Data."
- Click "Remove All" and then confirm.

3. Disable Pop-up Blocker: Live streaming might require pop-ups, so ensure that your pop-up blocker is disabled.
- In Safari, go to "Safari" > "Preferences" > "Websites."
- Scroll to "Pop-up Windows" and select "Allow" for MotoGP.

4. Check Internet Connection: Make sure you have a stable internet connection. Sometimes toggling your Wi-Fi off and on again can help.

5. Update Your Browser: Ensure that your browser is up-to-date, as updates can fix many issues related to streaming and compatibility.

6. Account Settings: If you're still experiencing issues, check your account settings by visiting the MotoGP account help section here. They provide guidance for any known issues with account access 5.

If you've tried all of these steps and the problem persists, it might be worth reaching out to MotoGP support directly through their contact page here.

Let me know how it goes, and if there's anything else you need, feel free to ask!