I’m having the same problem as reported in the support post http://user-meta.com/forums/topic/invalid-key/

After a user resets his password and then logs in, my standard redirect to referral (after login) is causing the “Invalid Key” message to appear.

So I tried the code you suggested as follows;

add_filter( 'user_meta_filter_list', 'user_meta_filter_list_function' );
function user_meta_filter_list_function( $list ){
$list[ 'login_redirect' ] = true;
return $list;
}

add_filter( 'login_redirect', 'ump_login_redirect_function1' );
function ump_login_redirect_function1( $redirect_to ){echo $redirect_to;
if( $redirect_to == 'http://audio-gear.org/resetpass/' ) // If redirect page is resetpass page
$redirect_to = get_home_url (); // Redirected to home url, you can use something else
return $redirect_to;
}

But this does not work.

Could you have another look at the code and let me know if you see any issues please.

Regards

Robert