I haven't done any mass operations on flashcards lately, no, nor done any of the other things you mentioned.
My key mappings for flashcards ("Buttons" button on the flashcards preferences panel) are "Scroll Defn Up", "Scroll Defn Down", "Score 1", "Score 2", "Score 3", "Score 4", "Score 5", and "Score 6". Those should all be safe, yes? And in any case I didn't hit any keys at all in this case; I'm quite certain about that.
My key mappings for flashcards ("Buttons" button on the flashcards preferences panel) are "Scroll Defn Up", "Scroll Defn Down", "Score 1", "Score 2", "Score 3", "Score 4", "Score 5", and "Score 6". Those should all be safe, yes? And in any case I didn't hit any keys at all in this case; I'm quite certain about that.