Could this be to do with 0.9.2.2 vs 0.9.2.6? Eitherway you aught to be upgrading if your forum is public, there were not insignificant security holes found in <0.9.2.6
In regard to this, you should see a line that looks the following:$Text = preg_replace("/\[url=(.+?)\](.+?)\[\/url\]/ie", '\'<a href="\'.Signatures_ParseUrl(\'\\1\').\'">\\2</a>\'', $Text);Replacing that with this will enable both urls and images (and you might also want to edit the description as well to let people know):
Comments
$Text = preg_replace("/\[url=(.+?)\](.+?)\[\/url\]/ie", '\'<a href="\'.Signatures_ParseUrl(\'\\1\').\'">\\2</a>\'', $Text);
Replacing that with this will enable both urls and images (and you might also want to edit the description as well to let people know):