Google calendar force closing after OTA update (SM-G930A)

I have a G930A, un-rooted, running AT&T's version of Oreo (8.0.0). I received an OTA update over the weekend and cannot use Google Calendar since--app force stops. I also cannot do a calendar insertion from Tasker. I have, of course reinstalled, cleared system cache, twiddled permissions, even factory reset, but am getting nowhere. Wife's phone has same update, but calendar is working fine. Baseband G930AUCS8CRK1 Build R16NW.G930AUCS8CRK1 Security patch level November 1, 2018 Any thoughts?