Looks like it's fixed in 1.2.47, thanks!
Just got the new ios update today (1.2.42) and started having this problem. I have a folder in the app synced with a folder on my laptop, and had no problems previously. But now if I do anything that prevents the ios app from communicating with the client on the laptop, the files all disappear from the screen. When I leave wifi range, or just shut down the client on my laptop, the folder in the ios app gets emptied out. If I restart the laptop client, the files reappear instantly in the app.