hrm, seems the only logical explanation is the neck is back bowed just enough to have the 12th fret buzz or the fret isn't seated properly. this is assuming you've ruled out that the string itself could've gotten knocked against the frets while moving the guitar, which could warp the string and create a buzz on the contacted fret/string(s). after that's ruled out....if you see the neck is back bowed, just turn the truss wheel towards the top side of the guitar, or counter clockwise looking towards the headstock. if you don't see a backbow it's possible it's so minute that you can't see it, so take measurements from the bottom of the string to the fretboard on various points and you'll know. if it all checks out I'd take it to a music man authorized dealer and have them check the frets. good luck, and let us know whassup!
