I have an issue with the low E string on my Acoustic Seagull S6 Original. Ever since I changed the strings, the E string seems to be out of tune in a weird way. When the open E is right on the spot (using a digital tuner) all the other notes on the fret board are slightly higher in pitch (like a quarter tone). The peculiar thing is that it's only on the low E string.
Worth mentioning I went from .10 to .11 gauge.
I checked the nut and the heads and there is no visible damage or anything like that.