And yes, I know how to go into the APP to set the behavior back, but it seems that in the last month the LED behavior has changed from the default of LED being on when light is off the LED being on when the light is on.
It seems to affect one switch at a time and not all switches, just a few of them.
This thread has been added to the first bug reports page in the community – created wiki. SmartThings employees do not monitor that page, it is just for the use of the community. Continue to report individual problems to support if you encounter them.