Haven't noticed the problem on any of my '61 RI's, but back in the seventies I was always trading & dealing Gibsons. I noticed a good portion of them, especially 335's, would have an unusual problem. If the G string was in tune open, it would sound sharp at the 2nd fret, and ONLY the 2nd fret. Had about 3 or 4 Gibsons that did that. As far as tuning stability & intonation, the newer ones are far superior to the vintage ones. Sound & playability?--that's another matter.