what I'm wondering is if this only affects games/saves that existed prior to the upgrade.
At least one person reported starting a new game and still getting crashes. The problem is looking like a GPU issue, as well, rather than a problem in the saves themselves (in the latter case, QA probably would have had an easier time reproducing the crashes).
Is there a way for an individual player to roll back the update so we can confirm the issues is due to the update or not, while using the same save? Or is the update built into the savegame now and it's impossible to separate the two?