Threads on google groups not on gmane?

[Paul Rubin]

Robert Kern <robert.kern at gmail.com> writes:
> I also don't see these on GMane. It's possible that they are getting
> caught in one of GMane's several levels of spam filtering.

I'm seeing some weird issues where google groups posts on another
newsgroup aren't making it to the non-google nntp server that I use.
The paranoid in me wonders if google is doing that on purpose, but it's
a pretty recent development, and other explanations are possible.