Why isn't Google Scholar working?

I keep getting "Google Scholar is temporarily unavailable".

Google periodically throttles access to Google Scholar when it’s experiencing a lot of traffic. Unfortunately, during these times our app is unable to search. Usually the problem passes after a few hours. If the problem doesn’t pass and you’re still experiencing difficulties, please let us know by contacting Support.

Articles show up in Google Scholar when I search on the web, but not in the ReadCube application.

ReadCube uses the Google Scholar API, and not the web search interface, when resolving articles to get the metadata, as well as searching for articles. (The same goes for PubMed.)

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