Comment: Newsletter, forums, sections/categories, future postings, and multiple installs questions

" 1. Should there be any problems in multiple installs of YACS on subdomains? "

You are right to mention potential issues, since I have faced these with the demo site of YACS. Because a single Apache server covers both, a single cookie is generated, and this may mean that someone logged as an authenticated user at one site may be induly considered also as an associate at the other site.

This is why I have added the instance path in session data, to break the scenario described previously. See how it works in shared/surfer.php.

To answer your question: YACS manages security across sub-domains since the Jan-28th release.