Works but no bypass...

[modsquad]

I finished the MOSFET BOOSTER and wired it like Jack had on his site http://www.muzique.com/tech/mosfet4.gif.  Works like a charm but bypass does not work.   I have never had one where that happened, may times the other way around.

[PerroGrande]

Check your bypass switch with an Ohmmeter. 

If you have it wired properly (also check), about the only remaining component in the equation is the switch itself.  While it isn't common to get a bad switch, it does happen.