Dynamically generated form elements not showing up in $form_values

I have the following code:

foreach ($emails as $key=>$email)
	{	
		$form["email_$key"] = array(
			'#type'=>'textfield',
			'#title'=>"Email $key",
			'#default_value'=>$email
			);
	}

It is supposed to cycle through the $emails array and generate a textfield for each. This it does. In fact, everything is fine until the form is submitted, then in my _submit function, when I look at $form_values, I can't access these values--they simply aren't there.

It only happens when the form fields are dynamically generated through a foreach or a while loop or something like that. If I hand-code them, it works fine.

For example, you'd think the following would generate the same form elements:

//Dynamic generation
while ($i <= count($emails)) 
	{
		$form['addresses']["address_$i"] = array(
			'#type'=>'textfield',
			'#title'=>"Email $i",
			'#default_value'=>$emails[$i]
			);
		$i++;
	}

//Manual generation
	$form['addresses']["address_test_0"] = array(
			'#type'=>'textfield',
			'#title'=>"Email 0",
			'#default_value'=>$emails[0]
			);
	$form['addresses']["address_test_1"] = array(
			'#type'=>'textfield',
			'#title'=>"Email 1",
			'#default_value'=>$emails[1]
			);

Well they generate the same exact elements as evidenced by this var_dump of $form:

Array
(
    [op] => Array
        (
            [#type] => hidden
            [#value] => send_mail
        )

    [addresses] => Array
        (
            [#type] => fieldset
            [#tree] => 1
            [address_0] => Array
                (
                    [#type] => textfield
                    [#title] => Email 0
                    [#default_value] => foo@bar.com
                )

            [address_1] => Array
                (
                    [#type] => textfield
                    [#title] => Email 1
                    [#default_value] => foo@bar.com
                )

            [address_2] => Array
                (
                    [#type] => textfield
                    [#title] => Email 2
                    [#default_value] => foo@bar.com
                )

            [address_3] => Array
                (
                    [#type] => textfield
                    [#title] => Email 3
                    [#default_value] => 
                )

            [address_test_0] => Array
                (
                    [#type] => textfield
                    [#title] => Email 0
                    [#default_value] => foo@bar.com
                )

            [address_test_1] => Array
                (
                    [#type] => textfield
                    [#title] => Email 1
                    [#default_value] => foo@bar.com
                )

        )

So while these look (structurally) identical, when FAPI processes the form, here's the contents of the $form_values array:

array(9) { ["op"]=> string(6) "Submit" ["addresses"]=> array(3) { ["address_0"]=> string(19) "foo@bar.com" ["address_test_0"]=> string(19) "foo@bar.com" ["address_test_1"]=> string(17) "foo@bar.com" } ["newsletter"]=> string(2) "45" ["desired_action"]=> string(3) "add" ["email_test_0"]=> string(19) "foo@bar.com" ["email_test_1"]=> string(17) "foo@bar.com" ["submit"]=> string(6) "Submit" ["form_token"]=> string(32) "81e29f92a47d7af15863d1d722eb2ae0" ["form_id"]=> string(31) "my_module_send_mail_form" }

WHY oh why are the rest of the $form['addresses'] elements disappearing? Why is it only when it is generated by a foreach loop and not when hand-coded?

Very strange...any help is greatly appreciated.

PS- I tried throwing #SKIP_DANGEROUS_CHECK on those elements just for fun but that didn't fix it.