Malwarebytes website blocking not working as it’s a protection tool and whatever is seen to be an inappropriate website that would be blocked by the Malwarebytes. When they have blocked some of the websites so they gave a alert that pop up in your screen.
These sites can cause the problem to your saved documents so its important for your system to work properly.
Its important to for the clients to once uninstall and reinstall the software in your system that would help you to solve the issue. Then also you are facing the same problem then contact tech support services of malware bytes.

More Info: https://www.antivirusonlinesupport.com/malwarebytes-customer-service.html