Sorry about the trouble you are facing. I would like to know if the steps suggested above by @Ton Frederiks worked for you? If not, I would request you to share a few more details like:
Exact OS & version of Illustrator
Is the issue related to a specific cloud document?
Does sign out and sign in from Illustrator helps to resolve the issue?
Kindly update the discussion if you still need assistance with it. We'd be happy to help.
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