Remote keys changed; can’t even program some of them

Hi, folks. I looked and couldn’t find anyone with a similar problem. I don’t even know what to look for in the logs. It’s very strange.

I installed 17.1 on Android 5.x (I have a HiMedia Q10 Pro) and suddenly some of my remote’s buttons stopped working: “Return” (“Back”) and “Menu” (“Info”), notably. Stranger, now my remote’s “Del” button now seems to be mapped to “Back”. Stranger still, if I try to use the Keymap add-on, I can’t even seem to map any action to my remote’s “Return” key. I can map it to, say, the “1” key, but that would kinda not work.

Any suggestions of what to try or look for in the logs?

Thanks.