Yes, your account has been likely been hidden by the system. It's an issue several POF members are having and it's being looked at. There is a thread dedicated to this issue if you want to add to it.
HIDDEN PROFILE PROBLEMS: Post all concerns here http://forums.plentyoffish.com/datingPosts15305784.aspx
I just clicked on it, and it asked me to sign in first, which may indicate it's hidden.
Hidden profiles can still be viewed via the Forums if the profile owner has posted. It is only hidden from search results which are all on the main dating part of the website.