Thanks for the prompt reply. I found another bug: the game locked during the Rude/Elena fight. I'm not sure what the cause was, but my last command was to cast the Enemy Skill Antipode for the second time. It worked fine the first time, but the second time, the animation didn't play. The music kept playing and the characters kept performing their idle animations, but no one got a turn, and the barrier gauges were frozen. I had to quit/restart.
EDIT: I tried the battle again without using Antipode, but the same lock happened. I had Elena down to ~2000hp, and my last input command was throwing a Deadly Wastes.
I've tried it a few more times, and it always locks, the only common factor seems to be Elena being at ~2000hp.
I changed the camera setting from Fixed to Auto and did the battle much faster with Demi/Laser, and it didn't lock. Very curious. I like leaving the camera on Fixed, but I'll make a note of it if it causes any more problems.