Originally Posted by NickMili
This isn't the case for me with my Harmony 880 ... I haven't changed the defaults that it programmed. Separate on/off buttons should actually FIX this issue that you speak of, as the remote knows when to send an "on" command (switching inputs) or an "off" command (powering off) as opposed to one IR code for "power toggle" which will turn the unit on if off, and off if on.
I'd check your device settings to make sure the power options for the AV receiver are set correctly - it sounds like something isn't the way it should be, although I can't say why you would have different options than me when we're using the same backend to program our remotes.
We might not be using the same backend. Like I said, my remote is 5 years old (H659). The client software (& firmware) is just as old, though I'd think the device database is the same. The 1120 replaced another Pioneer AVR (15 years old!). When I was testing the hookups and before I added the 1120 to the remote, the remote was doing just fine using the codes for the other Pioneer AVR (since Pioneer is Pioneer). After I added the 1120 and edited all activities to use the new AVR, it switches inputs fine, but started switching the AVR on/off when I pushed the same activity button twice. It didn't do that with the old Pioneer AVR. I started looking at the AVR device settings, and saw the default says separate on/off buttons. That's the only thing I saw that didn't correspond to reality (as the Pioneer remote had a single on/off). So I changed it and the problem went away.
It's also possible the presence of the legacy Pioneer AVR in my list of devices was throwing off some start/stop sequences, although I double checked it wasn't used in any of the activities. In the end, I deleted the legacy AVR altogether. So who knows, that might've been the actual cure. It works now, and I'm not curious enough to reprogram again to find out what really happened.