I can recreate the same problem, but I just realized that "Poker Blogs" isn't the Blogs and Ops forum like I thought, rather it's that old forum that we used to have where all the Poker News articles were also posted.

I'd guess that the "Poker Blogs" forum still exists and everything still gets autoposted there but it's just locked or otherwise set up so that nobody has permission to see/use it. For some reason it still shows up in the "Posts Since Last Visit" page though, which should probably be fixed.