I Was Having Problems With Setting Up MX-850 With MRF-350, So I Called Universal Remote Tech Support. They Stepped Me Through Each Proccess And Still Was Having Problems, What Is Happening Is, 1.) Remote Has Current Software Updates & Is Programmed Correctly, Per URC Tech Support 2.) I Set Up 4-RF Devices & 4-Buttons On Left Side Of MX-850. When Any 1-Device Button Is Selected It's Sends Out IR Signal Through Emitters To All Devices. Tech Support Said That MRF-350 Was The Problem. I Think It's The Most Current Software I Downloaded ??????