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's not good. Leave this envelope! Never has a "Miss France" come from the north. They usually look like crap over there. Give it back immediately. She wrote her phone number, goddamn it. It's a sign. She wants you to call her! Please. Let it go. She wrote her phone number, Philippe. (..)2011 The Intouchables