I\'ve updated my ggplot2 library and I am now having a problem where after calling ggsave, the graphics device no longer displays the plot. I\'m unable to resolve the issue
Seems to be an issue with RStudio. The issue is described here and here.
The workaround is to install RStudio V0.97.311, or ensure that you execute the ggplot and ggsave lines separately (i.e. don't select and run together in a block with control+enter).