Sadly this is one of those cases where it can be easy to get it wrong. It does seem worth investigating whether there was any breakage or behavior changes since 0.3.x days. We have changed CBlock to CBlockHeader and it is entirely conceivable that one might have output the "number of transactions" variable, and another did not. Worth checking.
Thanks Jeff. Do you happen to have access to the wiki? I didn't see a place to submit corrections. I was hoping I'd be able to submit something on the discussion page but there's no access to that either. I know it's a minor thing, but I noticed it and figured it'd be worth fixing up.
