I saw some issues posted here about trying to save from some plug-ins, and just getting returned to the options page. It was happening to many, like me, on Godaddy with windows. I've worked a solution:
you have to go into the .html for hte plugin, and find the action attribute for the form. For Adsense-now, the file is adsens-now.htm, and the line looks like:
<form method="post" action="<?php echo $_SERVER["REQUEST_URI"]; ?>">
Now change it to this:
<form method="post" action="<?php echo $_SERVER["REQUEST_URI"]; ?>?page=adsense-now.php">
the options will now post properly. I've made a similar change to easy-adsenser with the same success. the file is admin.html, and make sure to change the filename to easy-adsenser.php