Graphics do not appear or do not load in the viewer

I'm doing leaflet maps and they don't load me in the viewer. Likewise when I want to make tables with kabble.
This happens since I updated Rstudio and R. The strange thing is that when I change Rstudio to the previous version of R 3.6.2 it seemed to work fine ..
Another thing too, when I try to open a new page in the viewer to see the results in a browser, it doesn't load either.


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