I remember how it happened now: It was when Photoshop CC 2014 was introduced alongside Photoshop CC (14.x). I uninstalled 14.x once I was comfortable with 2014 but it ended up making the scripts go kablooey in 2014. Not sure why. I recall a couple of others having the same issue and they solved it the same way I did.
No biggie, of course. I can roll with the punches. xD