1.7.7 reported multisite bug (mu-ms installations)

So this the log of my reply, and the fix proposed x 1.7.8, without going to change nothing else in some other place/file:

Hello, i’m just around on fly to check the plugin compatibility with WP 4.9 (and all seem ok) and fix something, so i’ve remember about your message …

I found in your plugin that when I comment out lines 519 and 520
in this file: class.wp.w3all-phpbb.php (it’s wp_redirect call and exit), the
problem disappears and I can safely access wp-admin. Can you please look
into this and maybe fix this?

the solution to remove the code not work, because: if an user update his email in phpBB than click to go directly to wp profile page, may due to iframe mode or a direct custom link in phpBB to wp profile, the email field isn’t updated (it is updated on db, but will shown, until no refresh, as the old one (user’s data to display are retrieved before)).
The short workaround so may will be this:

if ( defined( 'WP_ADMIN' ) ) { // going on profile directly from forum iframe, update onload user's profile fields
     header("Refresh:0");
    //wp_redirect( admin_url().'profile.php');
    //exit;
   }

following and fixing for next 1.7.8 i found that nor the above solution is ok.
It not correctly do the right work onlogin.
SO another solution need to be found…