Hi Kathryn,
I think this is a common problem for anyone using this feature and is originating from Twitter making restrictions and changing the way they run Twitter. As you can can see on the Twitter Community forum: https://twittercommunity.com/t/again-list-widget-says-nothing-to-see-here-yet-if-logged-out/198782
I don't think there is anything Voice can do about this. However, we'll continue to keep an eye on it.
Sorrel