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Sync encountered an error while syncing, after 6.0.1 uptade

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Syncing was working fine, but after the 6.0.1 update on one computer, I started getting a: Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action.

If I click on the Sync now button, same error. I check my sync key and it's correct.

Syncing was working fine, but after the 6.0.1 update on one computer, I started getting a: Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action. If I click on the Sync now button, same error. I check my sync key and it's correct.

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The problem persists even after the 6.0.2 update. At one point in time on Saturday it did sync, but it still went back to not synching.