Try to clear history on ur browser and cache, maybe can help

Which menubar do you mean? The black one at the very top? You can't see it at all, or just some menu items are missing?
What browser are you using? I know with Chrome it sometimes bugs out if you were logged in for a very long time because the session runs out but it doesn't show you logged out properly for some reason. To fix it you just need to logout and log back in again, but if you can't see the menu at all you will just need to clear your browser cache like Cie wie mentioned.

It didnt work cleaning casge and yeah its the black one +_+
It wont appear in both browsers I use chrome and firefox

Can you post a screenshot of your browser with the site open in it please?

Erm......!! This is going to sound very retarded but the problem is solved ._.
The thing is that I do many stuff at the same time in my computer and I have my browsers always half of screen, I moved now the width of brower, made it bigger and the menu appeared.... now I make the width shorter again and the menu wont disappear no matter how short I make it so I dont understand why it happened but menu is back lol.......

I clear cache and even restarted computer twice and nothing until I changed width lol .-.