Ok, I think I found at least a mistake.
Did you see that cut track line next the 10nF? Jumper it, because that 10nF should go in the VB right in that stripe, instead now is isolated. But I think that is not enough to make the circuit mute, it controls just the high end cut.
I can't find anything else to make this layout failed. Anyway, fix that and test it.
If it still doesn't work... I'll write here the usual thing to check, just in case:
Position of the components, position of the wires, orientation of the caps, orientation of the diode, check if the pot works, check the jack connection, caps value, resistors value (compare the bands color with the resistors you have in stock).
If you want write the votages of the IC (is it a LF442?), and maybe you can post some pictures of the circuit.
Are you testing the board or is everything into the box?
I build pedals