I found if I change the projection to Web Mercator and then back to my preferred projection it fixes it temporarily and then it will mix it up again after a few exports. I made one textual change to a half dozen maps and sent them to a client without opening the PDFs yesterday. It's embarrassing and I know it's ESRI's fault, but like all abusive relationships, I blame myself for not opening the PDFs. How this just starts out of the blue is beyond me and it sets my hair on fire to use this software some days.
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