rendering errors of jupyter notebooks

[lrisguan]

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• When I open jupyter notebooks today, all get errors like: Unable to render code block
• Even a 200 lines notebook could not render

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[AmirhosseinHonardoust]

this is usually a github side notebook renderer issue (not jupyter). it can happen even on small notebooks if github’s rich rendering times out or fails. github is known to impose a short rendering timeout for notebooks, which can trigger errors like unable to render code block.
try (in order):
check github status (if github.com is degraded, rendering may fail until it’s resolved).
rule out browser issues: hard refresh, disable extensions, and try a different browser (this has been reported as browser specific at times).
workarounds to view the notebook now: click raw or download and view locally, or use nbviewer for public repos
if only some notebooks fail: remove heavy or interactive outputs (widgets or progress bars can add metadata that breaks github rendering) and re commit a clean notebook.

[lrisguan]

Thanks to your answer! I tested it right away. It's caused by a browser extension called Immersive translation. Turn off it, all works, also the pdf rendering.