Here's what happens.
A user deletes all of their cookies, starting with a clean slate. They navigate to the website and login. They are shown as a logged in user with a cookie with the following chips: bbsessionhash, bbpassword, bbuserid, bblastactivity, bbwelcomeheaders, bblastvisit.
Then the user navigates to the
Wiki. Instead of getting the wiki, they get the "All cookies cleared" message box which returns them to forum home. However, the site cookie still exists with the following chips: bbsessionhash, , <dbname>_mw_UserID, <dbname>_mw_LoggedOut, <dbname>_mw_session.
The user logs in again. Cookie now looks like: bbsessionhash, bbpassword, bbuserid, bblastactivity, bbwelcomeheaders, bblastvisit, <dbname>_mw_UserName, <dbname>_mw_LoggedOut, <dbname>_mw_session.
Now the user navigates to the wiki and everything works. Now the cookie is: bbsessionhash, bbpassword, bbuserid, bblastactivity, bbwelcomeheaders, bblastvisit, <dbname>_mw_UserID, <dbname>_mw_LoggedOut, <dbname>_mw_session.
Now close the browser (remember me was also selected when logged in). User goes to site and is logged in. Goes to wiki and cookies are cleared. Process starts all over again.
Cookie domain and path are identical between vBulletin and vbWiki.