What you are experiencing is HDCP (High-Bandwidth Digital Copyright Protection). This a a software within the set top box that will shut down any secondary source. I've linked a video below that explains this in a bit more detail:
Now, HDCP/SOC have developed quite a bit since this video was posted and some TV Providers will no longer allow Video and/or Audio to be transmitted if there is any HDMI cabling what-so-ever coming out of the set top box; in your case, as your set top box does not have any component inputs, you can invest in an HDMI adapter with HDCP Bypass, shown and discussed in this article:
In addition, with your remote reconfiguration issue, you will need to remove the Component configuration. I've linked these steps below, as well:
I hope this helps!
Sling Media Technical Support