Jenkins Users Read permission

[Gaurav yadav]

I am using Jenkins project based matrix authorization strategy to give project based access to users. I have created 5 different users and have provided them overall read permission apart from the job based permissions. Every thing works fine but whenever i restart my tomcat server on which Jenkins is installed the users start giving issues.
After restart when i try to login with any of the user it gives me error that the user doesn't have overall read permission. In the config.xml file the user have proper permission.i am not able to understand how a restart of tomcat affects the user permission in Jenkins. Need help in this regard.