I don't see why you can't view the threads, but maybe the mods are making changes of some sort to people who have less than 10 posts. The forum has been trolled quite a bit as of late so maybe they are instituting new restrictions. Of course, I'm only guessing.
Thread moved to the iMore Feedback forum....along with all the others on the same topic. Forum admins are aware that some people are having the problem. As you are aware, it's difficult to trouble shoot a problem that can't be easily duplicated.