If you have built your own version of RStudio from my instructions and srpm, do not upgrade to R 3.4. If you do, you will see a message like 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.
At some point I need to create a newer build of RStudio to take care of this problem. But in the mean time you might want to put an exclude statement in /etc/yum.conf or /etc/dnf/dnf.conf to prevent "R" from updating.
Update June 29, 2017. You can upgrade to the new R 3.4 if you then update your RStudio package as I mention in my next blog post.