Helio, your post didn't disappear and should be showing now, but the guest room is special.
We have to forbid non members posting at all because otherwise we get spam posts, but we made the guest room where they can post, but where the posts don't show up right away. The board asks me if it's ok to let them through by email and txt msg. (I keep wanting it to happen when I'm talking to someone so I can say "hang on, It's my web server in the US asking for instructions" 
)
I had to think a bit to recall what the problem was with the board, but I think I have it right now. You are registered and I think you can even log on, but as soon as you click anything you are logged out again. I thought at the time it must be a cookie problem and I've just thought of a way to test that as it goes.
In the meantime I've emailed you a new password since with all the testing we did last time you might not be using the right one now anyway. That won't solve it though unless something else has changed at your end since then.
Ah yes, if it's a cookie problem and you're using IE then go to menu:
Tools
Internet Options
Privacy
then move the slider down to the lowest point.
Log in to HF, which should save the log-in cookie.
Then go back to Privacy and move the slider back to where it was. The default is 'Medium' I think.
I use firefox - is it something similar, do you know?
I've never used it so I haven't a clue. You may have some sort of website list for which cookies can be allowed.