I'm honestly not sure. The thing is, I saw the Gaffy name change bug too, but that was isolated to my save file rather than to my LFT copy.
And, since it's a very slow weekend at work, here's a skillset compilation summary of how I feel things stand:
Basic Skill: Buffed to heck and back, happy with it.
Item: Still awesome.
Battle Skill: Seen it called overpowered on several occasions (mainly early on); not worried.
Charge: Works. Doesn't stand out, but there's not much else to be done about it, and it's definitely usable (just boring).
Punch Art: Was already considered at least decent, got nothing but improvements.
White Magic: Everything non-Holy was improved. Default skillset for revival (competing with Item). It's fine.
Black Magic: Ehhh. Got nothing but improvements, too, yet still feels underwhelming. Seems to be mostly ignored because Wizard is that good... but MAU just got nerfed. I'd like to look at this one more closely.
Time Magic: Is fine. Haste/Slow got nerfed, but near everything else got better.
Summon Magic: Got hit with a pretty large nerfstick and still competing for one of the best skillsets, so not worried. Just a large investment.
Steal: Quick Attack pretty much saves this from being 100% niche. That said, it's a popular niche, so again I'm not too concerned (and at least you get Steal Heart too). It does still kind of suck, but it sucking is strangely part of its balance (since you set it to get really good gear).
Talk Skill: Is really solid now. Competes with Yin-Yang decently, and has Br/Fa modification.
Yin-Yang Magic: There are a number of times where you'd rather status things out than try to slug outright (Hi Knights!), so its value went up in that regard. Life Drain got nerfed, but is still solid vs bosses. Status hit rates went up in general.
Elemental: Uhh... I dunno. I've argued raising it before, but mc is of the viewpoint that it still gets used when you're Geo and probably never set otherwise no matter what's done. Offhandedly, I'm not adverse to improving the formula's mult ([PA+X]/2*MA, where X is currently 2), but it'd be minor nonetheless.
Jump: Jump is good. It's just boring. Again, not much to be done.
Draw Out: Just went over this.
Throw: Same boat as Elemental except I can't even change the formula here, so yeah.
Sing: I honestly have no clue. It's great with a Mime, and I haven't seen it used without. All of the songs are pretty much usable without any screaming too good (unlike Dance, which is a sea of crap and then you have Nameless/Slow). I generally think it's fine, though.
Dance: Arguably overpowered, but... it's out of the way and it does get worse later in the game as CT charge times matter more. (Nameless Dance being the culprit, here, especially combined with easily accessible Mimes.) After all, it's not worse than...
Math Skill: When all's said and done, Math Skill is broken, but it's a very fun kind of broken, and now that it actually takes thought to use, I think we can be happy with it.
CONCLUSION: I'd like to look at Black Magic some, and see if we can change it up a bit (I don't think a buffing is uncalled for with MAU getting nerfed). My current idea is to drop the CT some more to distinguish it from Summon and increase the MP cost (so make it expensive, but faster casting). It still can't beat Summon in versatality or area, still has to deal with evasion, and still hits allies. Elemental/Dance/Steal are other stuff I'm unsure about, in that order of relevance.