Hey @Bart,
First of all, thanks for your patience with our delayed responses over the holidays.
Second of all, happy New Year! ๐
And finally, in regards to your actual issue โย I checked out your month view and found the problem you describe here. So I opened my developer console and tried again, and noticed that the problem manifests at the level of the server itself (so it seems) โย check out this screenshot here and see how the AJAX request itself is failing before it even finishes:

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I would recommend the following three steps:
1. Share your “system information” with us. Here’s how โ https://theeventscalendar.com/knowledgebase/sharing-sys-info/
2. Do the complete set of troubleshooting steps outlined here, and try recreating this issue after each step in the process โ https://theeventscalendar.com/knowledgebase/testing-for-conflicts/
3. If you do every part of Step #2 here and the issues still persist, I would recommend contacting WP Engine support about this and seeing if they have insight on why the AJAX requests are failing.
Thank you!
George