Originally Posted by: SuperhumanSometimes a littel twist on the truss rod can iron out intonation problem...

Yes, I think this is correct

Eg: when I first bought my bass , I set up the action and intonation.
A few months ago i adjusted the truss rod to improve the action, but i didn't check the intonation.
An hour ago I checked the intonation and on the 12th fret - it's sharp.
So I think if you slightly tighten the truss rod it should ' iron out ' the problem.