Not showing latest helicorder charts

My system has run well for a long time until today. Today is the 28th June. I checked the Helicorder Displays and the latest one available is 26th June. I refreshed the browser but no change. I checked the data files in /opt/data/archive/AM/R6B6E and there are data files for 27th and 28th as I would expect. The system date is correct too. I have an SSD on the system so df shows 11GB free so it is not a space problem.
If the files are there why is the Helicorder Display not showing the files?

Please attach your logs and we will take a look.