It also depends on which distance meter you're using. I think we all know that a 15 foot putt struck on the 15 foot meter goes a lot farther than a 15 foot putt on the 30 foot meter.
Putts outside 10 feet aren't my problem. Last night I made 3 putts outside 20 feet, and missed 4-5 between 8-10 feet. The 8-10 footers are killing me all of a sudden. I'm sure it's at least partly psychological, but I also think something's gone haywire on the tourney greens. A flat 7 footer struck at 9 feet should never come up short.. but I've seen it happen once a round lately.