Mass Email Unsubscribe is not working for me

Mass Email plugin is having a problem with users hit unsubscribe link in received emails -- maybe this is happening because I'm installing wpmu under sub-directory? (not using subdomain for each blog)

What happened when users hit unsubcribe link in their emails? Users only see a redirect to my main website! Though maybe this plugin is in conflicting with logout-redirect plugin? As I'm using that logout-redirect plugin (premium.wpmudev plugin) to redirect user to my main website when a user is logging out.

Any advice or tip to fix this issue? Thanks!