RStudio 1.1.383 messes up RMarkdown chunk highlighting

RStudio IDE
,
1

I've recently upgraded to version 1.1.383 which has some really nice new features! However in my .Rmd scripts the grayish highlighting is now completely messed up (as shown i the attached picture). Sometimes it's there, sometimes only a few lines within the chunk are highlighted sometimes only the first line of the chunk is highlighted etc..

Additionally the green arrows to run a whole chunk sometimes disappear.

image

Software-versions:
OS: Linux Mint 18.2 based on Ubuntu 16.04
rmarkdown: 1.6
knitr: 1.17

2

Can you please attach an R Markdown document that reproduces the errant chunk highlighting?

3

You can create a new Rmd file. It occurs in every of my files.
I realized it only occurs when you quit RStudio leaving the script opened. If then a code chunk is closed and you open Rstudio again the errant highlighting occurs. You can solve the issue by closing and opening the script.