Yesterday, I upgraded my version of R and today when I started a new session i got this :
R graphics engine version 12 is not supported by this version of RStudio. The Plots tab will be disabled until a newer version of RStudio is installed.
So when I tried to plot something like x <- 1:10; plot(x, x^2), it opens a new window.
I use R 3.4.0 and Rstudio 1.0.44 and when I search updates for RStudio, it is said that I'm using the newest version.