Having the same problem here... anyone with ideas?
No chart at all or just no data?
No chart - you could try running the configuration wizard for the website
No data in the chart - Check Orion services on the pollers.
Also check under Customize Page to make sure they are still configured to appear.
A reboot of the machine/SW fixed it – I just hope that isn’t going to be an ongoing fix.
Neil M Hicks