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It is possible, just edit the CSS. There is a bit of help there : http://punbb.org/docs/faq.html#faq3_3

if you have not changed anything on your website/forum, talk to your host

it is not in options, it is in your CSS files

As you hav Firefox, use the firebug extension, it would help you for simple debugging.
The line in the file depends on the mods you have installed
search for:
if ($pun_config['o_avatars'] == '1' && $cur_post['use_avatar'] == '1' && $pun_user['show_avatars'] != '0')
it is just below

Just add the code on main.tpl, before </body>. No need for a plugin

I don't think so, most of the forum users have no clue what html is. BBcode can allow to do nearly every text formatting without the security flaws that html editing would create

huh! Am I missing something or you are asking for a problem with the Vanilla forum software?

there must be a difference between main.tpl and admin.tpl otherwise you should have the same result on both pages

Ask your host, it looks like the server configuration has been modified

It is not possible as a standard feature and I do not think there is any mod to do it. How would you do to prevent SPAM with such a system ?

It is not a standard feture but there are mods for this functionnality on PunRes

Do you have the allow_html mod ?
There should be no html code, the variable $description that we get from viewtopic with if($post_count == 1) $description = $cur_post['message']; contains BBcode that is removed in meta.php by the function parser_del_bbcode(). if you have html tags in your description that means they were in $cur_post['message'] which is not possible for a standard punBB.