Hey Mike,
Sorry to hear about these troubles on your site – you’re right about several people having widget-specific issues after the update, and the tricky thing is that there isn’t quite a clear pattern so far. In other words, there are some issues popping up with the widgets, and thus far there have been different sources of the problems and different solutions for them.
In regards to your website, specifically, I’m curious: have you made any customizations to the “Upcoming Events” list widget at all on your site? If so, then does first backing up these customizations and then temporarily removing them affect your issues at all?
Next, I see that the mini calendar in your sidebar works fine, though this is from a “Google Events Calendar” plugin and not our own – if possible, can you try adding some of our other Tribe Events Calendar widgets to your sidebar, just to see how they compare in functionality to the upcoming events List Widget?
Thank you!
George