Our users had not been able to use the password reset function successfully in recent days. Just wanted to share the solution in case anyone else is encountering it. This could happen on just about any older Gavick template where they have not yet addressed the issue.
Basically the com_user override now MUST include the form data for username in addition to the reset token. Since the older versions of Joomla! did NOT require it some template overrides (such as the one on gk_mystore) must have it added back.
Here is the article from Joomla! forums:
http://docs.joomla.org/Confirm_password_in_1.5.16
And here is my working com_user addition in templates/gk_mystore/html/com_user/reset/confirm.php:
<td height="40">
<label for="username" class="hasTip" title="<?php echo JText::_('RESET_PASSWORD_USERNAME_TIP_TITLE'); ?>::<?php echo JText::_('RESET_PASSWORD_USERNAME_TIP_TEXT'); ?>"><?php echo JText::_('User Name'); ?>:</label>
</td>
<td>
<input id="username" name="username" type="text" class="required" size="36" />
</td>
Added right above the similar lines for TOKEN
Cheers,
Case