A curiously downplayed (and as yet unfixed) bug was introduced during a Marketo upgrade sometime in the past couple of weeks. Depending on the scope of your business, it can have a major impact and I think a lot of people aren't realizing they're affected.
Alert user DT pointed out on the Community and champ DS confirmed that Excel's so-called Unicode Text export format can no longer be used for Marketo uploads with non-Latin-1 characters.
Take a simple sheet like this:
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