I haven't remapped the keys in ages.
I retract this statement
I just remembered that a couple of months ago I tried a GV for the first time in forever, and I had to do something to make mode 2 work. I don't remember exactly what I did. I don't believe I remapped any individual keys though, I just had to get mode 2 working.
Looking at my stats, it was sometime in December.
Could this be a factor?