I'm on a PC, and I use Firefox, Chrome, and occasionally Opera, and I have never experienced any of the reported problems. I do not have any problems posting at all. I also have a Mac laptop, and use Firefox on it, and have never had a problem on that, either.What are you using? Safari? Firefox? Google Chrome? Something other?
One thing that does not work is being notified by email when someone posts to a thread I am following. Occasionally I'll get an email, but most of the time I do not. Also, when I went to register last summer, I about gave up because I tried three or four times and never received the email I was supposed to receive to complete the registration. I tried one more time, and it went through. And no, they were not in spam. They were simply never sent.