Thanks, DTLow. That’s what I thought it might be.
However, I have set that I want all notebooks downloaded for offline viewing so I would expect that the green lines would grow to full length as the notes were downloaded. Some notebooks have completely downloaded, some have green lines at varying lengths and some haven’t even started the download process. It has been this way for months - hence my question; I wasn't sure that the green lines did actually mean download progress.
I thought I’d start with a fresh system to see what would happen. I deleted Evernote from the iPad, then reinstalled from the App Store. I made sure that it was set for download all notebooks and watched what happened next.
As expected, all notebooks, that had notes in them, had a grey line under them and then green lines started to grow on some of them as notes were downloaded. However, an hour or two later, the green lines stopped growing and over a day later they still haven’t changed and seem to have frozen. So, I assume that the download process has stalled. I stopped and restarted Evernote, but no change.
I noticed another interesting thing. I chose a notebook that had only two notes in it and the green line was half way across the grey line so maybe that means that only one of the two notes has downloaded. To check this, I disconnected from the internet and tried to open the two notes and, as expected, only one of them opened and the other said ‘Note unavailable’. Then, I reconnected to the internet, opened the note that was unavailable and I could view it normally. Maybe this was because it had just downloaded. To check this, I again disconnected from the internet and I could view the previously unavailable note — so that note had, in fact, downloaded. This is all as expected.
However, when I view the status of that particular notebook, it still shows it with the green line only half way across the grey line, as it was before I manually downloaded it. That screen has not refreshed since the note was downloaded. This might not be a big issue, but I now don’t know how much of my Evernote library has downloaded. I’m not confident that I can go on my next trip away from internet coverage and still have access to all of my notes.