I have a blog where my student interns post their replies in the comments section. One of the students is having difficulty posting - she says that when she hits "submit comment", an error message pops up that says: "Error: please enter a valid email address." She says otherwise, the rest of the window is blank.
Any thoughts on what's going on and what I can do to fix the problem? Might it be related to the fact that she has a gravatar associated with her email account?