If the reports have had data in the past this is most likely related to the metric processing pipeline.
CloudWatch Daily metric collection occurs between 09:00 and 12:00 UTC. CloudHealth conducts a metric rollup process at 12:00 UTC (9:00 AM EST). You will not have daily CloudWatch metric data available for the current day until collection and rollups are successfully completed.
As a workaround, please check the report filters and ensure that if you are reviewing before 12:00 UTC that the daily interval (default) is not selected.