The cause of the problem was not 'immediately' clear. [=is was not known right away]
They live in the house 'immediately' [='directly'] behind this one.
We need to leave 'immediately'. [='at once', 'right away']
(..) That explains the baby./ Oh, Carlos./ Great. Alright. Eddie, here's the deal. We made a major mistake last night. We need to get this marriage annuled immediately. You do annulments?/ Of course I do annulments. It breaks my heart and gonna make me very sad. But it's not a problem. I'm gonna (..)2009 The Hangover