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']
(..) - Oh, yes? - It concerns Clouseau. - Yes, go on. - He's to be reinstated as an inspector. What? You can't be serious. And he's to report immediately to Colonel... Sharki in Lugash. I see. - Sir. - What? It's a birthday gift from my wife. Most realistic. (..)1975 The Return of the Pink Panther
(..) you say so, sir. Yes. Because I'm a bigger liar than the beggar. You are suspended for six months without pay. Six months? Effective immediately. Have you anything to say? Could you lend me francs? I- Will you get out? Out of my sight! Yes. (..)1975 The Return of the Pink Panther