Hello,
We are running multisites on a joomla 1.5.22 and recently we had some issues and we had to do a complete restore. Before the restore everything on the slave sites was working fine. And by everything i mean shared users from the main db, shared kunena forum (users, sessions, posts, everything). Now after the restore the users are still shared, kunena content is still shared but u don't get to be kept loged on the slave sites as it worked before. I've checked in multisites tools and everuthing seems to be in good order. I have the shared sign next to com_kunena the kunena_sessions table has the shared sign also so it should be working fine. If u create a post on main and go to the slave site it's there, the only thing you have to log in, and this is an issue because it's part of the main reasons we bought jms in the first place, to fix the single sign on issue. Thank you for your support.

Perhaps your problem is related to a bug in Joomla 1.5.16 and higher as discussed in the post.

www.jms2win.com/en/forum/26-bugs-errors-...d-acess-problem#4708

I've checked the suggestion you made regarding a known bug in joomla but that's not the case because i've created a new slave site using the same template created earlier (template used on creating news and videos) and the test site keeps the sessions logged on and also replicates all the posts made on main (and vice-versa - the posts from test are replicated to main). I've checked the configuration files from test with those of videos and news and couldn't find anything relevant there. I've also noticed that in multisites directory almost all the folders are links (for instance public_html/multisites/videos/components/com_kunena is in fact public_html/components/com_kunena). So if they are using the same files, in multisites tools the com_kunena is shared , tables have the shared symbol also, and a new slave site works.. what could it be?

You mentioned that content of the "master" and "slave" is identical when you change something in a website.
Did you checked that you are logged on the correct website.
Put a specific website title to check that you are correctly logged on the correct website.
When a website is not defined in the list of slave, this display the master website.