R Notebook dark display

Please ask your questions about R Markdown here. Hello guys I can easily open a blank space Rscript or Rmarkdown to work on. However, if I close it and want to open it later to continue my work, it's showing a dark space, like my script is completely dark and I cannot even close it; I had to either stop or restart the computer. Please can you tell me how to solve this? Thank you.

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