I've had that happen to me a few times these past couple of weeks. Haven't figured out why besides thinking that at some point something in the config file gets corrupted. It happened one file, simillar to what you're going through. Devices wouldn't show up, it wouldn't let me delete or edit the name at times, sometimes it would change another device, etc.... I finally sludged my way through that remote by just working around these issues. Then a few days later I used that previous config file to start a similar remote and had the same issues so just had to start from scratch.