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See https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0437 through https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0431.
I took a look at a few seconds and am not seeing any issues. There are some small formatting changes that are expected, like the hamburger menu icon being tweaked, and a visible drag handle now showing up next to the sidebar.