Proof for us is completely shut down with a popup about Classic expiring that persists when opening a Proof. No workaround, can't do anything with a proof, clicking OK does nothing. And we are not on Classic. On hold for quite a while with Support, at some point I have to get on with my evening. Sheesh.
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We are having the same issue with Workfront Proof - we've already moved to the New Experience and we're getting a popup warning about the upcoming change and we can't get it to clear.