Thank you very much for your help! It looks like you're right about it not accepting punctuation in titles - I'm pretty sure there wasn't any in the Sennen Cat scene though, so it might be a combination of punctuation and length, as title length was the issue in another game I tried working on a few months back.

As for the akujiki issue - could you give more detail? Is a_03-61 unreadable, or does the game freeze up like with previous errors? Does it start from the very beginning of that scene, or in scenes after?