Good evening J Robert and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the month view no longer working on your site. Yikes!
I would love to help you with this topic.
There are a couple of things worth trying to fix this:
Thoroughly disable all of your W3 Total Cache settings and empty the cache to see if that helps
Try different settings for Events Template under Events -> Settings -> Display
Try temporarily reverting back to a default WordPress theme such as twenty-sixteen to see if that helps (using a “maintenance page” plugin for that purpose)
Let me know how that goes.
Best regards,
Geoff B.