You said the film is "old-style", but is it in-date? In my experience, Diafine can be a problem with outdated film, because it doesn't control fog worth the proverbial hill of beans.
it was kept frozen, has expiry of 11/2008. There was a discussion about whether this film would keep on the web, and some guy had spoken to Kodak who said if you freeze this film your grandchildren will be using it. So should be good for a long time.