I don't know if you've discussed this with mod ivy or not, but if you make a change in the display via the control panel, that will reset the cache for you. Also, mod ivy just told me that she cleared cookies and that seemed to work for her.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .