If you’re comfortable modifying code, this solution will prevent the error in the broken template for individual events: https://ww.wp.xz.cn/support/topic/fatal-error-in-formating-datetime-object/#post-15783227. Note: By adding this code, you’re hiding the listing of ‘upcoming events’ that will display in the single template.
Unfortunately, it will not address admin weirdness, like the events all showing up on the same day in the calendar view.
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This reply was modified 3 years, 6 months ago by spalberti. Reason: clarity
Same issue. Just found it today. Please post back if you find a solution, but I’m assuming that we have to wait for the dev team to address this, or possibly rollback to an earlier version of the plugin.