Hi,We raised a daycare ticket for this issue, there was a property value missing in "Diff Observer Factory"Property serviceUser.targetThis was introduced in 6.3, thanks for looking into this.

Hi Karthik, were you able to figure out the root cause?I also have same issue.Please share your findings, thanks in advance.

Found the issue, it is because of ACS commons AEM Environment indicator configuration.I cleared all the fields from configuration and it worked for me, we were using Browser title property to display server name on tab hover.We cleared all and it fixed the problem.

Have same issue, has Adobe provided any fix for you?Few observations from my end is:1. On a fresh install the title works as expected.2. On upgraded 6.4 with SP4 [6.4.4], there is flicker on tab title. For a fraction of second I see page title appearing then it goes back to "AEM Editor".Checking if ...