When Windows Live Messenger is locked/hidden using Messenger Plus, all Messenger and Messenger Plus windows should disappear and all new ones be hidden as well.
If Messenger is hidden, and then somebody adds you to their contact list, the notification that allows you to block or allow them and add them to your list is not hidden like the rest of Messenger.
Steps to reproduce- Start Messenger with Messenger Plus and sign in.
- Have Messenger set to notify you when somebody adds you to their contact list.
- Hide Messenger (by pressing Ctrl + Space or using Lock Messenger in the menus).
- Have somebody add you to their contact list.
- Messenger will notify you even though all of Messenger should be hidden.
My software versions are Windows XP Service Pack 2 (5.1.2600), Windows Live Messenger 8.5.0816, Messenger Plus! Live 4.23.0.276 but I've seen the same bug with older versions as well.