Yes, the steps leave your user files intact because the My Documents-->NinjaTrader 6.5 folder is not removed, and thus not over-written when re-installed.
Additionally, if you rename the database you are only clearing NinjaTrader of historical data, ATM strategies, and Performance Reporting, and this will not have an effect on the workspaces or templates since those are stored elsewhere within the My Documents-->NinjaTrader 6.5 folder.
This is why renaming the database was suggested as the issue pertains to the historical data of certain minute charts independent of the workspaces.
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