My students today were experiencing a frustrating bug in the Viewer. When you click on a dataset to see the preview, it shows some values as 0s. But, if you print the data in the Console those values are actually NAs. Students working locally weren't having this issue, so I assume it's related to Cloud.
I think this is the same as this bug, which has been fixed (but just a few days ago, so I don’t think that is reflected in Cloud yet):
I think it’s a 1.2 thing, rather than specifically a Cloud thing.