I just gave my trusty D28 its annual string change a couple of days ago. I put on a set of Musician's Gear light gauge strings (.012 - .052) Never tried them before. I tuned the guitar up, and everything seemed fine, until I tried a couple of barre chords a few frets up. With a capo on the third fret, the sixth string really sounded sour, it was noticeably flat. It was worse up the neck, nearly half a semitone at the harmonic. Only the sixth string, the other strings seem fine. This guitar has NEVER been like that.
I have two guesses.
First guess, the guitar doesn't like the light strings (I've always used mediums.)
Second guess, something is wrong with that sixth string. Maybe those Musician's Gear strings are not any good. They look fine, nothing that appears to be the cause of this.
I thought I'd run the question by here before I try a different set of strings, although I hate to take off a brand new set of strings. (I'll use a set of Martin strings this time)
Anyone have any experience with those Musician's Gear strings?