Page Comparison

...

If the werk mentioned above is the cause, this workaround might also help before installing p9:

1. Remove all Host/Service Statistics Snapins in all dashboards
   
   
2. Save them
   
   
3. Re-add them
   
   
4. Then reload all dashboards in the browser.

If this does not work, please open a ticket and add the ~/var/log/apache/access_log of some of the affected sites, which might show many entries like

...