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Hi,
I’m also experiencing this same problem. I’m trying to use Matrix on a brand-spanking new install of 2.4.0. I have the exact same stuff showing up when I try to edit/create an entry. Also the Matrix field formatting looks different (i.e. not quite right) when I edit/create the matrix field itself.
I replaced the themes folder with a fresh one, just for kicks and removed all third party plugins that i had installed (not very many and not the one mentioned in the earlier post).
It’s still broken. Any other thoughts on what this could be?
Many thanks,
Lauren