Whoops, set the wrong switch there. Ah well, at least it won't break the cutscene later. I'll have that fixed next patch.
Funny- I haven't got a single shop that sells Mythril. It is a Sample reward in a few areas, and a 50% drop from Cave Worms as well. (A certain medal might come in handy, now that I think about it...)
EDIT: Oh dear. Things are probably happening out of order. Let me check.
EDIT 2: Great, I forgot one conditional branch and now you can skip to the second dungeon when it doesn't make sense. I'll release a re-re-patch to prevent that in just a bit.