I'm stumped and, admittedly, no expert in setting up a Harmony. I have a 670 I've had for years and haven't messed with it that long since it has always worked. I've put the Chromecast into the HDMI2 input on my TV where the DVD used to be. Hitting "Play Movies" on my Harmony properly turns it on to the proper HDMI input and the proper A/V setting. I can control volume for the A/V but I cannot control anything else...no pause...no fast forward...etc. I've tried to change the Harmony settings umpteen ways and nothing changes. So, the question is, am I simply not doing something right or will the Harmony NOT control extra functions?