My brother in RPG Maker, no need to apologize you're a saint for even being here with me in this lol
So you're right, I have the Myth Block plugin disabled as I'm not intending on using that mechanic. Unfortunately neither fix has worked for me, even if I enable the Block plugin or not. I don't for a second think that it's something that you've messed up, though. I'm sure there's something that I've done that is preventing me from having this work. Either way, I'll share my error report here with you:
rmmz_managers.js:1974 Uncaught TypeError: Cannot read property 'call' of undefined
SceneManager.onError @ rmmz_managers.js:1974
rmmz_managers.js:1975 chrome-extension://njgcanhfjdabfmnlmpmdedalocpafnhl/js/plugins/MYTH_VisuMZ_CompatPatch.js 647
SceneManager.onError @ rmmz_managers.js:1975
MYTH_VisuMZ_CompatPatch.js:647 Uncaught TypeError: Cannot read property 'call' of undefined
at Sprite_SkillCard.useDigitGrouping (MYTH_VisuMZ_CompatPatch.js:647)
at Sprite_SkillCard.Window_Base.drawText (VisuMZ_0_CoreEngine.js:9588)
at Sprite_SkillCard.Window_Base.<computed>.<computed> (VisuMZ_1_SkillsStatesCore.js:4001)
at Sprite_SkillCard.drawText (MYTH_CGC_CoreEngine.js:3492)
at Sprite_SkillCard.drawSkillCost (MYTH_CGC_TextFormatPlus.js:702)
at Sprite_SkillCard.drawCardCost (MYTH_CGC_CoreEngine.js:3412)
at Sprite_SkillCard.drawCardCost (MYTH_CGC_TextFormatPlus.js:674)
at Sprite_SkillCard.drawCardBitmap (MYTH_CGC_CoreEngine.js:3341)
at MYTH_CGC_CoreEngine.js:3314
Third time's the charm, but I'm also willing to just take the L on this one and not use VisuMZ. You've been nothing but helpful and kind and I appreciate it.