:( I'm around, still joining arguments that have already been resolved. I think it's pathological.

Most GMs can be expected to [i]read the IC[/i], Raineh Daze... What I'm saying is that it simply isn't up to you. You should trust the GM to regulate her/his game, and if you think something that happens in-character is supplanting the plot or doesn't belong, THEN you bring it up with the GM and the players, and there's a discussion.

You can't assume intentional game-breaking malice in everyone who wants to make their character an amnesiac, basically. I understand, it isn't ideal, and if I were GMing a game with an amnesiac character I'd at least want to have some idea myself, but it can't be generalized as always leading to bad things. What if their ideas are actually supplementary to the main plot? They saw something they shouldn't have, and one of the kings' court wizards erased their memory using dark rituals or something? Wouldn't that be an interesting reveal?