It seems that the settings aren't taking effect straight away no matter what we do.
Previously, it gave an error message saying it needed filling in. The icon only seemed to appear after plenty of messing around with the settings - going in and out of the app. I don't think we understand what corrected it.
Similarly, even though the app told us it was downloading cartridges, and they were appearing in the folder, it has taken a few goes to get it to recognise what's is doing.
There just seems to be a lag in getting things to happen!