I was hammering away, and all of a sudden, the Function light came on and stayed on. No amount of hammering Fn would make it turn off, though it did blink with every press.
Then I realized that I hit Right shift at the same time. This appeared to toggle it on and off. Thinking it might be a physical problem with the keyboard given the proximity of the keys, I decided to experiment. I hit Fn and LEFT Shift, and the same thing happened. That would seem to negate a physical problem, since THOSE keys are not right next to each other.
Sometimes, using either shift key, it takes a couple presses to engage or disengage the lock.
At least I don't RECALL reading about a lock function.
