Just had this happen to me. By some reason the rebels ended up with two provinces in Persia, that is they both where owned by REB. Got a CTD when I selected them, and the savegame could no longer be loaded. I think it might have to do with a civil war the Seleucids had, when I looked in the autosave, the date which REB gained ownership of those provinces seemed to be the end-date of a Seleucid civil war.
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