Viewer stays empty after simple gm task

RStudio IDE
1

I want to use the gm package and tried to use a very simple code to check whether it was working (below). The code is working, it shows up in environment, the viewer opens but stays empty. I made sure R and R Studio are up to date. I can only imagine there being a problem with the program, but I can't find any recent posts on this. I also tried out a patch from last year, unsuccessfully.

library(gm)
music <- 
  Music() +
  Meter(4, 4) +
  Line(c("C5", "D5", "E5", "F5"))

show(music)
2

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