Concerning to ths 'not visible' button...
I suppose you have edited admin/orders.php
Check if you have two edit buttons.

Search admin/orders.php for:
PHP Code:
$contents[] = array('align' => 'center', 'text' => '<a href="' . zen_href_link(FILENAME_ORDER_EDIT, zen_get_all_get_params(array('oID', 'action')) . 'oID=' . $oInfo->orders_id . '&action=edit', 'NONSSL') . '">' . zen_image_button('button_edit.gif', IMAGE_EDIT) . '</a>');
You have here 'button_edit.gif.
Just create a new gif button and replace this filename with the new one, like I did:
PHP Code:
$contents[] = array('align' => 'center', 'text' => '<a href="' . zen_href_link(FILENAME_ORDER_EDIT, zen_get_all_get_params(array('oID', 'action')) . 'oID=' . $oInfo->orders_id . '&action=edit', 'NONSSL') . '">' . zen_image_button('button_edit_alter.gif', IMAGE_EDIT) . '</a>');
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