Downloader, won't take typed codes

I have 4 Android boxes. Each one has Downloader installed. On one, the McCool box, I cannot enter website or a number code. I have deleted a couple of times and reinstalled. Nothing made a difference. It is frustrating because Downloader on that device is useless. Any suggestions?

You’ve made sure all permissions are turned on. Allow unknown devices? Other than that you’ve done everything that has fixed it in the past, might be something you missed check it out again.