We have been using this file in Box for weeks, suddenly today the ribbon is missing and I can not see who else is editing the file. I have tried unclicking the "simplified ribbon" on the top right, but nothing happens.

We have been using this file in Box for weeks, suddenly today the ribbon is missing and I can not see who else is editing the file. I have tried unclicking the "simplified ribbon" on the top right, but nothing happens.

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