Once PM is read it keeps on popping on various pages. In short sometime it gets visible and sometimes it disappears.
If I create new thread, post or what ever I edit which I wrote, it doesn't appears at once it takes more than 5 minutes to appear which didn't happened before. Even refreshing the page again and again doesn't resolves this problem.
There is this issue of login and logout.. I have to refresh website using ctrl+f5 to appear logged in or after i logout to be actually logged out. Please look into this as well.
ps. Im using Firefox