Here's the deal... I've got a Cort Curbow 6, with dual truss rods. I'm trying to get the action lower. The neck had a little bit of bow in it, so after tightening the truss rods a little, I started to get some weird problems. On the G string, I'm getting fretbuzz in the first position. On the D string, I'm getting fretbuzz on on just one fret, the 3rd to last one, which would make it the 22nd fret I think. The note just totally chokes.. one fret behind it or in front of it, everything is fine. The C, B, E, and A strings are ok, no problems with them. What could be causing this? I checked out Gary Willis' site and there was nothing of use for this problem there.