Menu admin not working

[Pdaal]

Hello,

At this moment a magento (1) site the menu does not work in the backend. it disappear but when you click on it, nothing happens. The menu in the frontend works well. Someone any clue? 

[Damian Culotta · Accepted solution]

Can you check you browser's javascript console?

Maybe you're getting a JS error and that's why the menu isn't working.