Thank you for sharing the alert message you received, Jeffrey3.

Let's perform browser troubleshooting steps to determine if this is a browser-related issue.

Start by logging out of QuickBooks and logging back in to ensure the system updates. Next, refresh the page and add a new product.

If the same error occurs, log in to your account using a private or incognito window. This can help avoid problems caused by cached data, as an incognito window creates a clean browsing session without stored cookies or history.     

Refer to the following keyboard shortcuts specific to your browser:   

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + N
• Safari: Command + Shift + N

Then, can use other supported browsers to ensure a smoother QuickBooks experience.

You can drop a comment below if you have additional questions about this.