Problem with custom login system

[accessdev]

Hi,

i m currently workin on implementing the login of my website on a vbulletin forum

i created a key vbUserId in my user table and successfully plugged it in vbulletin so i m able to appear logged as the correct user on vbulletin after logon on my website.



all seems to work well , except that all the post i made after login as marked as posted as "Guest" on the forum

and *only* in showthread.php (eg on forum/index.php i m able to see that last poster was my user and got a link to correct profile)

When can i search to find the issue ?

note that i m using 3.8.2 with no plugins

the only modification i made in vb is in class_core.php around 2750

if (LoggedOnMainWebSite()){
// setting $userid and $password variables
}