boxes with question marks

after working on a document i've been working on for a while, several black boxes with question marks appeared and i can't undo.

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Exactly what do you mean by “working on a document?” Exactly what are you doing and with what version of Acrobat?

- Dov

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- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)

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