#4: You have a a pre-release copy. ... and from what it sounds like, you have an OLD pre-release copy. Imagine, something not working in a pre-release ... ooh. Things change, man. If you have a copy where there's no support for the "Off switch" META tag, they probably hadn't written the support for it yet. Pre-releases aren't feature complete from day one, it's a long road until then.
Interestingly enough, I still haven't found a META code sample that will turn them off (but I haven't been looking, either, so I guess that's where that gets me...)