Hello, I'm not so fantastic at this that I can afford to not ask the most basic questions first, please pardon me 
I understand that both R console jobs and Rstudio started failing out in their graphics plotting duties, and that now when you run trivial plot request, you receive failure error, and no plot.
Have you reset the sessions ? (Ctrl+Shft+F10)
Sometimes sessions can get corrupted after all.
Alternatively, if you would like something else to try, before that route, it might be worth halting the graphics device. dev.off() and trying that elementary plot again.
Of course, if your issue is persistent, across to new sessions, then I will definitely have to bow out in favour of others with more expertise to think about this.
Regards,
Nir