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Tapping on "2" or ">" at the bottom of the Conversations page doesn't work unless you're signed in. This is more annoying than it needs to be, given that you have to sign in so frequently. At least once a day I tap "2" and nothing happens.
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In Safari, I go to the Lightroom Classic forum, scroll to the bottom of the Conversations, click on "2", which turns grey but doesn't do anything. I scroll back up, sign in, and then when I go back and click on "2", it goes to the second page.