JazzyVee:
Since it's only occurring on the D and G strings, and since ALEMBICs have a split adjustable nut, I would check the D/G half of the nut.
A very basic test is to fret each note at the third fret (G on your E-string, etc.) and hold it.. Now press the string down on the top of the first fret with your other hand. There should be just enough movement (clearance) to where the string should tap the fret as you do this. Do this across all four strings. If the G and D are already touching as you press at the third fret, then loosen those strings, loosen the center cinch screw in the nut, and screw the G/D side screw to raise it a little until it feels the same as the E/A side. Then tighten the center nut screw, and re-tune.
As always, SMALL adjustments can make a BIG difference, so raise it in baby steps. One-half of a turn is a BIG jump, so go smaller than that.
A G/D side problem could also be the truss rod on that side. If the above did not apply and you didn't need to do that, then it is down to the bridge height / neck relief / nut height combination; that is, your action needs to be tweaked on the G/D side. This is possible as ALEMBICs have dual truss rods. If you are comfortable doing it, then you can go from here. If not, do you have any access to a PROFESSIONAL technician? This could possibly be the fret rising out of its slot, but I doubt that. A thorough check of your set-up would reveal this, but I doubt that's the problem.
There is also an excellent primer on set-up in the ALEMBIC website.
Best of Luck,
Joey Wilson
