Sorry if I didn't explain that well before, but yes, that's the only way this is happening to me, specifically in response to Aerith using Seal Evil, nothing else was triggering it. Glad to get that cleared up with you! I hope it won't be a hard fix or anything.
And I admit it's pretty minor as far as AI script quirks go - but I appreciate that you'd hear me our on it and take such a thing seriously. Warms my heart to know there actually are still modders/hackers out there that will listen, and give a damn about the quality of their work, not just say "It's too minor, don't care, live with it", or "It's not a bug, it's a feature!" when it's clearly incorrect and even counter-productive behavior, so, thanks for hearing me out! I'm too used to running into seemingly-friendly game mods that turn out malicious (to the tune of being insanely tedious rather than trying for actual difficulty) and the mod creator just doesn't care. Or even defends it saying "good hack design" or whatever nonsense excuse they might come up with to say that bosses spamming 3000+ damage Luminaires in Chrono Trigger is totally fair and challenging gameplay. Heh.)
Also - after applying the last hotfix (not sure if that's coincidence or the reason, just mentioning it for context), as soon as Aerith leveled up (and eventually once Cloud leveled up as well), the "Exp to next level" did something...wonky. I don't know if this was intentional, but it seems strange that it would be happening just as soon as I applies that latest hotfix. (And I'm using the Stand Alone Installer, no the Seventh Heaven IRO...whatever the heck the other one is, sorry, I'm totally inexperienced with this sort of thing - this is the first time I've ever used a mod with a Steam game, but someone with much more experience led me through the install and all. Anyway!)
How do I explain this... Yuffie is Level 31. 95,068 Exp acquired, 27,828 to the next level, that's about 1/3rd of her Exp bar at the moment. Cloud just now leveled up, hit Level 32. 123,031 Exp acquired, 11,948 to the next level, totally empty Exp bar. ...I'm sorry, what? Why did my Exp to next level suddenly drop so drastically upon hitting Level 32? I believe Aerith did the same thing, suddenly needed like, a third the Exp to next level as I would have expected, as soon as she hit Level 32. (She's now Level 34, needs 11,576 to next level, bar has only filled up a little, maybe an 8th the bar or something?) Am I supposed to be suddenly gaining levels a fair bit faster? Is this intentional?
Secondly, the Mythril Diver in in Mythril Mines - this one seems more likely to be game mechanics than anything incorrect with his AI, but I'd rather double-check just to be 100% sure - I'm not a total expert on FF7's inner workings by, like, any stretch of the imagination, so if this is normal and intended behavior, all well and good, just wanted to check it with you, and be sure.
Whenever Mythril Diver dies, he's supposed to have a death counter, that big tidal wave attack (totally taken from Apps, heh!), and it's supposed to hit the full party - is that correct? Well, whenever I kill him with Choco/Mog, he gets Confused as expected - and then hits *one* character with that tidal wave. (Unless he's out of MP, of course, though that much seems 100% intended behavior, that the tidal wave is supposed to charge him MP to use it.) Seems random too - the first two times, he hit the Choco/Mog summoner (so I thought maybe it messed up his counterattack to be single target rather than multi-target - I've seen this when tinkering with FF6's monster scripts, that normally multi-target spells that have no option to single-target will only hit the attack despite the spell's targeting saying otherwise, so I thought it was possible to occur here as well) - the third time, though, he hit Cloud, who had only targeted him once previously, with Steal, and that was at least a few turns prior. Is Confusion supposed to affect death counters like this? Is that totally normal?
EDIT: I just met Ziegfried in the forest outside Junon (my first encounter there). He went through a comical spiel on me. Failed to summon Odin. And then sat there for like, a couple dozen turns saying ": |" at me. After the battle, I was on a totally black screen - but the hand icon was still there showing I had spawned in. I even moved around, and the hand followed me. I was given an MP Plus Materia - I went into my Triangle menu - and when I exited the menu, a field just POPPED in out of nowhere, looking for all the world like the same area you'd see Yuffie in vanilla when recruiting her (minus the Save Point and the appearance of any party members; only Cloud was visible). ...I mention all of this because I reacted to all this with someone I was talking to online - and they said that this wasn't what happened when he encountered Ziggy, that the dude actually completely committed suicide, no real "battle" took place at all, much less the chances I go to Steal (nothing) and Morph (nothing, heh) from the guy, much less steal all his MP about a fourth of the way through his 9000 HP (it was only 50 MP, but still, didn't want to chance the guy suddenly remembering how to be competent and thrashing my party out of nowhere, heh). Did my Ziegfried act up? Did you change Ziggy's behavior at some point in the last year or so?