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I found the solution!!!

I just got a mail from Steve Machol at vB, and he kindly gave me the link to this page, which solved the problem.

My users and myself are having issues with blank pages, forbidden and not acceptable errors, what can I do?

There is a very good chance your host has installed a add-on for apache called mod_security.

While mod_security can be a very powerful tool, misconfigured or overly strict rule sets can interfere with vBulletins Operation. Below for Apache users you can use an htaccess file and add a specific rule to disable mod_security.

Create or edit a text file named .htaccess for your main forum directory and add the following code:

Note, place this file in your main forum directory.

And by main forum directory, I assume that he means inside the folder where the forum is located at my server, and not the public.html folder that also contain other sites and folders as well, or am I wrong here?