There are a couple reasons your Daily History Charts are not rendering. Below you will find the solution to them.
1. Reported problem: Daily history charts in Mingle do not render. You continue to notice the message: "Please wait... We are preparing your
chart. It might take a few minutes..." This issue is seen only if you have fronted your Mingle instance with apache.
Solution: Please make sure that the following setting is enabled in the apache config file
RequestHeader set X_FORWARDED_PROTO 'https'
2. Reported problem: You continue to notice the message: "While Mingle is preparing all the data for this chart, the current values for each series are displayed below. Revisit this page later to see the complete chart."
Solution: If the start date for the DHC is set to a future date, the chart will not render until it reaches said date. Please double check your start date if you are noticing that they are not rendering in an expected amount of time.