A "Rplots.pdf" at the root of the project directory

[valscherz]

Could be explained by :

I had a similar problem recently after upgrading to R-3.0.3 (yes we're a little behind!). It turns out that palette("default") opens a device now, though it didn't used to.

https://stackoverflow.com/questions/6535927/how-do-i-prevent-rplots-pdf-from-being-generated

[valscherz]

Was a known bug of ggplot, tidyverse/ggplot2#2787, solved by 25f6436