I have found the same problem with Detailed Reports. It appears that now these need to be exported reports for the period chosen (month, year, etc.) I have found that a running balance (if requested by clicking on it in the custom field) only shows up if the report is exported as a CSV file, but not if it is exported as a PDF. I know this doesn't help those who want a daily/monthly running balance in a detailed view, but it is one way of tracking the balance by transactions. Hope this helps.
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