The point I am making is you need to be clear
on what you actually think your issue is. Just because some one tells you your setting is wrong does not mean it is.
Your talking about some forum bug maybe.
You came here making a broad base false statement saying our cookie tutorial is wrong where it is not and actually our tutorial as stated can be backed up by facts.
phpBB3 is a free forum there is no support or guarantee that when your posting on that free site your actually getting responses from someone who knows what they are talking about.
The point I have made is that if cookies are set correctly there is no issue with being logged in either application. As I posted I have already looked at your site and it appears to work perfectly. If you log in to the gallery you are logged into both apps. You logout and login to the forum you are logged into both apps.
If you set your cookie domain to
the resulting cookie only works over the forum.
Since your cookie domain is
that cookie is readable over EVERY
subdomain on your site making it sitewide.
That is how you get a cookie to be used over an entire domain name because if the subdomain is different that is a completely different url.
You would have to deal with forum bugs with phpBB3 developers as a piece of software should have no issue reading cookie settings that you set in the application and being that the cookie settings are site wide there should be no issues.
The problem your going to have dealing with phpBB3 is it is a free forum and no real support meaning the answers your doing to get 99.9% of the time are going to be from non developers.