Unable to set permission

This is a bit of a weird bug. I am running multisite. On of the "slave sites" has a drigg install. If I dont share users and stuff, authors can post, edit and delete their own content. However, if I share users, they can only post, not edit or delete except for admin. Also the same issue if the permissions table is not shared. I'm assuming permissions can't exactly be handed over to the "slave" site cause it does not have users?

Help.

Kahenya