Hi Duane, since a month ago, radar data from Argentina are very scarce, almost inexistent. Are you aware of this?
I so, what is the problem?
Same situation on Rainviewer web page.
However, radar data is being produced because it is being posted on the oficial web page from National Metereological Service
If data is missing in both Flowx and RainViewer, then the issue is most likely upstream from Flowx. RainViewer is generally good at processing data so I suspect the issue is upstream from them.
Check out there data sources page for Argentina radar sources and follow these upstream to see if there is an issue.