When running reports in Core using As Of date filters, user experiences errors or sees data for the wrong dates.
Cannot create a connection to data source 'BQE_GlobalDataSource'
It seems that Core reads the As Of date filter in the reverse order. So if English (US) is not set as the first language in your browser, say Google Chrome, Core does not display the As Of date filter correctly.
Instead of opening day-month-year in this case (English (UK), it opens as month-day-year, resulting in an error at times.
For now, the workaround for this issue is to change the language settings in your browser. You must set the default to English (US) or keep it the first one in the order in case of multiple languages. That allows you to run the reports in Core. If you have to, you can change this setting back to your preference later.