Just to add a bit more detail. I have a repeating task due every Monday. It has been working fine. I saw that it had been brought forward to Sunday, as explained above. I ticked to complete, as a test, and the new task has been created as due Sunday again - even though the repetition pattern is "every Monday".

This type of issue is often the result of mismatched timezones. Would it be possible to double check to make sure that your timezone setting in Remember The Milk matches your system timezone on any computers or devices where you use the site or apps? It's also important to check the location of the timezone to make sure that they match.

Hope that helps!