Ninja250.org no longer allows "flat" viewing, as it didn't interact well with the rest of the forum.
Actually, this line from the FAQ pretty much says it all....
"Everything about the site at ninja250.org is purposeful and intentional. Our admins have been tweaking it for the past eight years. It's exactly as we like it. It isn't going to change." And I thought
I was old.
They go on to list a variety of other forums you're welcome to try.
That said, I really like the magazine, and continue to read it.