If I didn't have such high opinions of Zen Internet I might be tempted to believe that they're actively filtering out certain content from the newsgroups. It just isn't logical for two different binary postings to be made by the same person using the same well-known usenet provider, only for one of those postings to fail to appear on Zen's news servers altogether. By binary posting I mean a collection of rar files accompanied with parity files, not a single binary posting.
Seeing as one of my main reasons for sticking with Zen over the last 6 years has been decent newsgroup provision, I would have to seriously reconsider who I give my custom to if I am required to purchase a Giganews subscription.