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The code works fine, I just tested it.
I believe you actually have to send a POST request without req_file set to trigger that error.

It would also lose meaning.
For example:

[url=http://punbb.org/forums/viewtopic.php?id=6859]You might want to try this modification[/url] ;)

versus

You might want to try this modification ;)

Not to mention that stripping it would be very annoying to code.

An extension, possibly, but I doubt it will go in the core.

Then that's not admin activation per-se, that's simply trying to block spam registrations. For example:

http://www.punres.org/desc.php?pid=347
http://www.punres.org/desc.php?pid=400

http://punbb.org/forums/viewtopic.php?id=18195
http://punbb.org/forums/viewtopic.php?id=10943
for example

erased messages? I don't know what that means, it's not possible that updating the forum would do that.
As for double login, I usually see that in sites that are accessible both with and without the www., like yours is. You can either redirect all traffic to one of the two or set $cookie_domain in config.php to .forocure.com.ar

Upgrading is a good idea.
If that doesn't fix it, enable debug mode and paste the full error.

I don't know how GeSHi works, but my assumption is that it's the result of a double escaping via htmlspecialchars.
Try

FIND

$geshi = @new GeSHi($text, "autoit", PUN_ROOT."/include");

REPLACE WITH

$geshi = @new GeSHi(html_entity_decode($text), "autoit", PUN_ROOT."/include");

make a function, like is done for the URL tags, parse in there and return the parsed value.

If you're running that outside of the parser, the HTML is going to be sanitized for obvious reasons./

Right. We added a CSRF token to the logout URL, with the token being a pun_hash of user ID prepended to the current IP.

My original thought was that you had the Akismet modification installed and that was the reason for the delay, but since you don't have the plugin, I doubt the modification was installed.
Anyway, your best bet would be to enable debug mode and see if the page generation time when posting in those cases is high or not. If it is, then you need to figure out what is causing there (most likely a modification of some kind).