Blank charts mean data exists but is not reaching the visualization.
Check Date Range
Most common cause. Your date range may not match your data period.
Check Filters
Report and chart filters can exclude everything. A RegEx filter matching nothing causes blank charts. Remove filters temporarily.
Check Data Source
Yellow warning = needs re-authorization. See data source errors.
Check Field Types
Swapped metric/dimension types break charts. Verify in data source settings. Contact us for diagnosis.