I have the same issue and this box is idiotic. I have an LG 60LF6090, a Sony surround system and the Contour cable box.
The remote is programed for TV and Amp, the remote will not control the TV inputs it allows you to access the input menu but you can not select the input (poor design probably), my older box and remote worked fine on the same TV. The all on/off button turns everything off except the Contour box. I tried the first 4 codes that would operate the volume but none operates the input.
I went into the settings menu and change the setting for HDMI Control under the Lab menu, this works but only the first time you try it, it will not work on subsequent power cycling.
The HDMI control allows the TV to send a power off command to all HDMI devices attached, it works on everything but this sub-standard box.
After talking to 5 agents with limited knowledge, the last one said that there are settings they can change on their system to fix this, she tried and failed. Now they think I need a technician as if the tech is going to reinvent this boxes OS.