Review Funnel loading circle disappears and reviews don't download

Very infrequently I have a customer who can't download reviews from the Review Funnel. It usually happens with non-english reviews. If you click the Download button and it disappears and nothing happens.

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Open up a Console window, by right-clicking > inspect > look for the console window. Check it for messages like so...

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In this one you can see a database error on the meta_data field. This fix is to change the collation on the database column. 

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Usually it is the review title or review text fields as well that have trouble with characters. 

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