When I click the “Show XXXXX truncated lines” in either of the output cells in this notebook in Chrome (on macOS), after a certain point the output becomes white, and the other string cell becomes white as well. (I can still select text in the other cell but it doesn’t get highlighted. I can even click on the expand link there too and the other cell gets bigger):
Can anyone else reproduce this? Expanding the output works fine for me in Chrome on Windows and in Firefox and Safari.