When you copy and paste the source code of a page which is generated by memberlist_email.tpl, in the W3C validator, you get some errors. Try to copy and paste the source code of this url for example: http://www.phpbb.com/community/memberlist.php?mode=email&t=588697. One is a reference to an id ("lang") which doesn't exists. The weird thing is you do not get when you pass the url to the validator.

Change in prosilver

<dd><select name="lang">{S_LANG_OPTIONS}</select></dd>

to

<dd><select name="lang" id="lang">{S_LANG_OPTIONS}</select></dd>

I do not have a solution for the validation errors of

.

document type does not allow element "input" here; missing one of "p", "h1", "h2", "h3", "h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del" start-tag