Tyr any one of these,
As expected, the issue had nothing to do with the quicklaunchmenu :).
The proble was that a Telerik RADEditor solution was deployed to all
content web applications, including the SSP. The solution added a few
lines of safecontrols to the SSP web application, which doesn't have the
prerequisite AJAX extensions setup. Removing those lines solved the
issue.
or
copy the Web.config from other Port, put it in current Port, and add in the “SPXmlAdminContentMapProvider”.
or
solution:
you have to add two assemblyIdentity entries in dependentAssembly of
central admin web config for System.Web.Extensions and System.Web.Extensions.Design
to bind redirect from version 1.0.0.0 to version 3.5.0.0