Dexp Twitter won't work

Hi, I want to display a twitter feed, so I proceeded to enable the Dexp Twitter block (tried both). I've created an App in twitter for that purpose and I acquired all the needed keys... The problem is that when I configure the Dexp Twitter block to show in a region, then my whole page won't render. Nothing in localhost... I'm able to access the administrative pages though, but content wise I can't see a thing... Any ideas what might be wrong?