donatien

Look under settings->discussion:

http://codex.wordpress.org/Settings_Discussion_SubPanel

Like Ipstenu said, you may have granted people the right to act like this. I looked at your source code and you correctly claim to use the GNU General Public Licence (but fail to attach the licens file, which you are required to do – it’s here: http://www.gnu.org/licenses/gpl.txt).

If you look under section 7b you find that you may “supplement the terms” with among other things:

“b) Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it”

I can’t see that you did.

So it’s nasty in every way, but perhaps not illegal (I’m no lawyer) to do what he/she did. I do however second that the plugin should be removed for ethical reasons alone.

Another thing, please remove the style declaration in the widget and replace with a class or id for styling. The text-align: center; just about drove me nuts 🙂

Seems to work here – except for an annoying thing – after a user logged in – the page went blank. This is due to wp_get_referer() returning false. Changed the redirect from assuming wp_get_referer() returns something to:

if (wp_get_referer()) {
	wp_redirect(wp_get_referer());
} else {
	wp_redirect( $_SERVER['REQUEST_URI'] );
}

That seemed to fix it for me.

Have you tried inactivating the plugin to see if it makes a difference?
Is there anything in your server error logs?
How “blank” is it? Does it load anything or is it just a white page? What do you get when you do a “view source” on the page (there might be stuff there that the browser won’t show)?

Have you looked at add_shortcode? Just wrote a snippet that did exactly what I think you want using that. Sorry if I missunderstood the purpose, but I use it something like this (simplified):

function thefunction() {
	$mycustom = get_post_custom_values('somemeta');
	foreach ( $mycustom as $key => $value ) {
		$mystr.=$value;
	}
	return $mystr;
}
add_shortcode('thetag', 'thefunction');

The you just put [thetag] whereever you want in your post and it gets printed right there.