I've never seen anything like this before..

When you die in the Campaign the melee button stops working when the game reloads..

Restarting the game fixes the melee button, but that is the only solution i have found.

I have even mapped the button to different keys and tried using an xbox controller that is connected to my pc and it does the same thing..

So it's definitely a glitch..

Is anyone else having this problem.. If so, anyone go a solution... ???

Hello

I have had the exact same problem as you.
THe use of it does come back after a while annd you can also still do silent takedowns when you get the notification message... just freestyle melee doesn't work.