Have "Member Access" installed on a multisite with Suffusion, and when trying so view the Landing Page I've created by using a Page with Custom Template that has a Slider, I get this
Warning: Cannot modify header information - headers already sent by (output started at /home/schecter/public_html/dmiworks.com/wp-content/themes/suffusion/header.php:26) in /home/schecter/public_html/dmiworks.com/wp-includes/pluggable.php on line 881
The page has been given access to non members, and tried just about every combination. Only works when the plugin is disabled, so it appears to be a conflict. Is there something in the error message that you recognize?