Problem with widget

Can anyone help me?

My blog has been running for 2 months, and I have no problem before. But today, when I want to add something to my widget, I can’t click or edit any of them.
Usually when we click on i.e. ‘Text 1’ than it will pop up a window for us to key in, but this time when I click, nothing happen. It just like clicking on screen.
This also apply when I tried drag and drop, it just not working.
Please help
Thanks.