Hey guys, I have been having some problems with my intonation lately, particularly on my high E and B string, when it is played open, it is perfectly in tune, when I play a harmonic on the 12th fret, it is flat, and when I play the 12th fret, it is sharp. I have an Ibanez GRX40 if that helps.
Are the strings new? If they arent, go change them and follow this tutorial
umm ya change the strings, and if that dont help get yoru pick-ups adjusted.....and your bridege even possibly