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2018-05-10 08:03:53.066 [P2P6] INFO global src/cryptonote_core/blockchain.cpp:1464 ###### REORGANIZE on height: 1568536 of 1568547 with cum_difficulty 14490123635886036 alternative blockchain size: 13 with cum_difficulty 14490179675843288 2018-05-10 08:04:38.570 [P2P6] ERROR blockchain src/cryptonote_core/blockchain.cpp:886 Failed to switch to alternative blockchain


These were likely bugs which are fixed on the current release-0.12 branch. There should be a new release in the next few days to a week, which will include these fixes.

See these:


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I synchonized a few mins ago with ./monerod --db-sync-mode=fast --fast-block-sync=1. [ OUT] Synced 1569721/1569721 Try start with clear database(--data-dir="your_new_dir") or --offline to determine where the trouble(database or net connection)

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In my case helped: monero-blockchain-import --pop-blocks 2000 then monerod --block-sync-size 1

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