I just got my new DX today and it is my first smartphone! it came already loaded with 2.2 so iI hope I won't encounter the issues that I've read on here! I have 2 questions about the DX 1.) I have little black boxes with a check mark in them and was wondering what they meant? The online Moto user guide doesn't have that listed! 2.) What are task killers that I've heard about? Thank you in advance!