I have subscribe2 installed on a 3.1 wpmu for about a year. For most sites it works great, but on a couple it does not work.
If I, the multi-site network admin, make a post on one of the trouble site the post goes out fine. If I login as the site admin and make a post it does not. So I next deleted the site admin account and recreated their user account, subscribe2 worked again making a post without using quickpress. The site admin then created a post using quickpress, subscribe2 does nor email the post nor will it email any posts done through normal, non-quickpress posting. At this point, subscribe2 sends emails if network admin creates posts, but not site-admin's posts, their account needs to be deleted/recreated to work again.
Any ideas? I looked for any other subscribe2/quickpress issues but found none.