First it was not light up. When switching off and on on the Profiler now the light of the Lock button reacts to the Editor and vice versa. But it does NOT lock the input and it does not lock effects.
Not when locked in the editor. Not when locked on the profiler. Never at all.
I've just noticed that the Lock is actually working fine in Browser mode but NOT in performance mode. Both input menu and the effects chain are locking correctly in Browser mode so the problem is particular to Performance mode only.