a. If you leave a message open and start opening menus, when you receive another message, the message that was left open pops up on top of the menus. This may be intentional, but its annoying. Usually I want to keep navigating my menus without being forced to close the PM.

b. When an open PM pops up on top of your menus (same situation explained in a.), when you close the PM, suddenly youre thrown back to the main menu.