Your GC100 (as mine) has three IR ports. In Beta 4 all of them are showed separately on the Interface page. So, you should specify one of them as controlled by for desired device - TV, cable box etc. Please, let me know about results of your installation. Because I cannot find appropriate codeset for my Toshiba TV to use it with GC100 IR emitter. In Beta 3 it works fine with Pronto Codeset - 0062. In Beta 4 it doesn't work with any codeset. So, I'm curious if it's a bug of I do something wrong.