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Total data loss between 24.5.0 and 31.1.1

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Version 24.5.0 upgraded to 31.1.1. Data in the right two panes are GONE.

Version 24.5.0 upgraded to 31.1.1. Data in the right two panes are GONE.

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The machine memory itself is not the problem. When I load up the system, I can see no data.