We didn’t get the log when we previously disabled plugins and switched to the default theme. Since this is a live site, using a different theme is not an option. Attached to this post is a slight variation of the same issue, where the first screenshot is a reduced amount of upcoming events, the second is the results of clicking next (instead of blank or the amount it’s supposed to shows only the farthest in the future one), the third being a fully populated upcoming list when clicking previous after the second screen. This happens with Safari, Chrome, and Firefox.
It’s probably down to a conflict with the Elegant Themes framework, but using another theme is non-negotiable.