Sometimes, when I click on a link to open a document nothing happens. What's going on?

Chances are, you have pop-up blocking software on your computer or a pop-up blocker enabled on your browser. Usually, that's a good thing. It gets rid of annoying advertising pop-ups you probably don't want to see. But pop-up blockers also can keep you from seeing the pop-up windows you've requested for links and forms.
(Another possible cause of the problem: you may have JavaScript disabled, either through a manual setting or via your browser security level.)