Hey DLPB, welcome back. Was just gonna mention one thing about MO things, and if its a known issue and been looked at, sorry to beat a dead horse. It's the graphics for the materia in the menu system. I couldn't figure out how to get Grimmys materias with Felix framing etc for a while... was always getting felix materias (which are gorgeous... but they cause that pixel issue or exaggerated line after last slot is filled and single).
Finally pulled the 5 b_l files from menu mod folder, cleared menu cache and reloaded game to no materias, then switched em back in, no cache clear this time... and for whatever reason, got Grimmys materias in game... even tho they weren't in the mods folder. I'm puzzled by that one. I repeated that experiment at least once with same results. I suppose they must have been loading from the menu lgp because reclearing the cache would give me back Felix's materias. I did eventually realize that by installing the original MO graphics option with grimmys materias, would install grimmy's materia frames and his materia textures.
In the end when I saw Grims mats I really liked them (they aren't quite as pretty as the felix ones, but they don't really cause much of a graphic glitch on that last single slot mat), but due to slight colorblindness I had trouble distinguishing between the yellow and green ones. So I brightened the yellow one up a bit. Since then I pretty much felt like that last release of MO was perfect... Is this something you might look into if it hasn't been addressed already? I'm not married to those Grimmy textures, though they have a certain dark charm to them, but that graphic glitch on that last slot mat trips my OCD every time. My absolute ideal would be the Felix materias with no glitch... the texturing on them is just beautiful. Sorry for the long post about something so minute...