I haven't had time to check to see if this is a problem across all strings, sorry. It showed up last night after a string change and a quick intonation. I fear that I don't do the intonation the best way -- just open and 12th fret depressed. How do I incorporate the harmonic into this? And what about that 5th fret that's sharp? This was on the G string and I'll check the others tonight, plus at other spots on the neck. I know intonation is a compromise, but this seems wacky.