Hello manifdart,
Thanks for upgrading; sorry you are experiencing this!
I’ll do my best to troubleshoot, but its much more difficult without being able to reproduce the problem. The absolute best way to do this is to disable plugins. But let’s give it a shot!
The maps on single-events are generated using the addresses you have supplied. That’s why the maps on those pages work just fine http://manifdart.org/evenement/ron-benner-london-canada/
On the Map View that is failing though, those positions are latitude and longitude; data points generated automatically in the background from the addresses you supplied.
Typically, if that map is empty, if means the data points aren’t there and that the lat/lon script has failed. This can sometimes be caused by a theme/plugin conflict. And this of course is best tested on another site by deactivating plugins.
Here is something to try for now. Can you slightly change/update the address on one of the events? This may trigger the lat/lon generator and put it on the map.
Does this make sense? Let me know if this doesn’t work for you.
Cheers!
– Casey Driscoll