I've had it happen a twice, rendering my ring finger unusable for any kind of abuse for almost an hour. I think it comes from enormous pressure on the g-string.
are you talking about sharp pain in the tip. If so I defenetly get it sometimes. not too offten. usualy after playing alot of accustic blues with bends and all. I use mediums on my accustic so it's quiet a workout.
I'm not alone! I get that exact ring finger sting. Had to put .008's on one of my strats for when it acts up. Mine is pretty quick but can be quite exscrutiating. I don't get it when I play on .008's.