I've had some issues myself.

Couldn't get it to work at HR John Wayne. Gave up as it was a short stay and didn't spend much time in-room.
At HR Orange County, at first couldn't get it to work. Tried resetting the network on my iPhone, cycling tv on/off. Didn't work until later that day.

At Andaz SD, I had to figure out myself that you had to hold the input/enter button to change input. Inputs weren't labeled so I just guessed. Then it worked.

There's definitely some inconsistency, but if it's a big enough issue I'd call the front desk.