FF6 - Brave New World

1: Atop the Cultist Tower, I open the chest. I opened my menu, then the chest looked again like it was closed when it was looted. Odd.

That's because it's not technically a chest. It's a chest tile that gets modified by an event. This is because the chest doesn't contain an actual item.

3: Hyper Wrist: This applies auto-Bserk, but it feels like it should also boost physical damage (stacking with other physical damage boosters).

The berserk status does raise physical damage, and it should stack with the Atlas Armlet. Damage boosters do not stack with each other (a second Atlas Armlet has no additional effect beyond the first besides raw stat boosts), so the effect you're looking for is actually present in the Hyper Wrist's current incarnation.

4: Does Morph recharge with Terra outside the party?

Nope.

5: In Ebot Rock, if I feed the chest enough stuff to pass then reenter Ebot Rock, why does the chest demand more stuff?

It would save me a lot of money if, once I ate, I never got hungry again.

6: If I attack with a brush, why does it heal Undead?

This is probably a technical limitation. Healing effects do not inherently damage the undead; rather, that's a setting that needs to be applied separately. I don't believe it's possible to apply this setting to this particular style of healing.

7: Fanatic Tower: I'm unsure what happened but the game froze! I was in a battle against 2 Slamdancers and a Demon. (Lv. 40 and 50 Mages) I killed the Slamdancers and the Demon was still around. It was Relm's turn (Sabin/Terra/Strago/Relm) and the game just froze. I could choose Relm's action, but the rest of the world stopped. Terra was still stuck casting her spell.

What spell was Terra casting?

8: Reflect is meant to halve the numeric effect. It doesn't seem to halve Rasp.

Reflect does nothing to magic defense. Maybe you mean Shell?

Shell only reduces magic effects by 1/3, not by half. No idea why it wasn't affecting Rasp.

9: After beating the White Dragon: "Look to the right of the chest." Huh? I already got the relic (Death Ward) from that dragon's room. I checked to the right of the chests in the tower but found naught.

Then you either didn't check all the chests or didn't check the right spot.