This sort of problem makes me wonder, could Dash Core 12.1 not have handled the migration of the data folder (and delete the caches etc) automatically? Maybe it's not a huge problem now, but if Dash had Bitcoin's userbase, there could be millions of people with mysteriously "disappearing" wallets all asking for support, which could be avoided if it was managed in one place by adding migration code to the app. (I'm not implying that writing such code to work reliably would be easy, however.)
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