News that might be helpful about this situation.
2 different plugins
a) cb_invites tab
privacy works pretty fine here. Each member can see his own invites!
b) cb_coupon field that shows alone in a new created tab named "coupons"
privacy does not work! Each member can see all created coupons from everyone.
Both tabs have exactly the same privacy settings!
So... this problem can not be related to privacy plugin. There must be something wrong with with the cb_coupons field, or the plan, or something.
I remind you that everything has been created according to the following tutorial...
www.joomlapolis.com/documentation/283-cb-paid-subscriptions/tutorials/18407-purchasing-discount-coupons