Hi Media X, thanks for the prompt reply.
Yes I tried clearing cache. And renaming all theme folders but twenty thirteen to force default theme..
But now I found something, a bit mysterious…
I have always been accessing my site via URL frame redirect. Yesterday the drop-down menus stopped working.
Now I tried accessing it via quick link domain alias – and it worked!
What is mysterious is that via URL frame redirect I’m allowed to login to my site, but the menu links seem disabled..
Do yu have any clues why it could happen?