The Union Platform forums have moved.
Given that this forum still seems to work, that came as a big surprise to me.
You see, this link: http://www.unionplatform.com/forums/viewforum.php?f=3 still works.
That's how I get here.
But this one: www.unionplatform.com/forums/index.php gives you a 404 error.
But if you drop the index.php part from it, and use
http://www.unionplatform.com/forums/
Voila! You get redirected to the new forum on Google groups.
I guess they figured everyone was using that last link.
In my case at least, that wasn't so.