Members signature areas.

[Tanabe]

I've noticed that some of my members signature areas won't show up no matter what I do. It looks likes its doing this with most of my new members signature area, not all of them but most of them. I tried editing their account putting in a signature saving it and tried refreshing but still no signature shows up. I even tried cleaning out the signature cache. I still can't figure out whats wrong. Any ideas what I might be missing?