Authorise on custom site 4.1.16.1 error

After upgrading to latest version i have problems with authorising on my portal. Before upgrading all working fine!

This code does not work:

	require_once SITE_PATH.'forum/init.php';
	\IPS\Dispatcher\Build::i()->init();
	if( \IPS\Member::loggedIn()->member_id )
	{

If i do logoff, login on forum - it's work. But in next day i see guest again.

All cookies exists.

Oh, sorry. Did not see cookie path. After upgrading path is changed.