I have a sling 500 that I just installed a Xfinity system with two boxes. The main box is an Xfinity XG1A box and the secondary box to which the slingbox is connected is an Xfinity RNG150N box. The current remote is the Xfinity XR2.
When I initially installed the system, an older comcast remote was used as the on-screen remote. However, several buttons did not work, including "my dvr", all of the controls, stop, play, ff, rewind, etc. I also am having the double-click problem, where I click once and the machine reads it as two clicks. This makes it impossible for me to choose "saved programs" for example. I have tried various different
Try this Custom Remote. Should give you all the buttons and cure the double-click problem.
I am away for the next 2 weeks so if you a problem with it I will not be able to help.