My Rstudio version is 3.4.1 64-bit on Win10. I have installed the package wordcloud2 via the commands
install.packages('devtools')
devtools::install_github("lchiffon/wordcloud2")
And things went smoothly. Then I tried running the example from the official documentation on R console:
letterCloud(demoFreq, word='R')
Then what comes up is only the background colour, and nothing else at all. Web browser is Chrome 59.0 64-bit. However, the other function wordcloud works quite well.
I suppose this should be a common problem, so hopefully somebody can give me some help, thanks.