Message to Admin

I try to use NOTIFICATION. When I select a message (to view it) I get this Error message:

Sorry, you are not authorized to view this page.
Please try logging in or logging in as different user Login or send a message to the admin

although I’m logged in. what is wrong here ?

It is very hard to find my own messages on this forum manually after few days, so this feature is a MUST. It works for some messages and for some it does not.

the problem must be in the security settings of your browser, either java, and or allow popups