Ipstenu (Mika Epstein) on "[Plugin: Varnish HTTP Purge] Broken-ish After WordPress 4.5 Upgrade on DreamPress"

Hello!

After upgrading to WordPress 4.5, I am getting an inteal server error after trying to publish a post or make changes to my site navigation. I had originally been told that the error seemed to be with Jetpack but, after disabling all of my plugins and re-activating them one at a time, I was able to make changes with Jetpack enabled and signed in, but the problem started again after re-enabling Vaish HTTP Purge. I've since cleared all my caches in my browser and on the site through SSH, but I am still having the same issue.

I am not entirely sure if any of the following information is helpful, but just in case it is, here's other stuff about my setup that might (maybe?) throw a wrench in the works:

* I'm on DreamPress
* I'm using a Let's Encrypt certificate (issued through the DreamHost panel) to enable HTTPS
* I am using a custom theme, but the same issue happens with Twenty Sixteen as well, so I don't think that is the issue, but ¯_(ツ)_/¯

Let me know if there is any other information I can give you to help debug this, or if this is a known issue, or if I'm just super-lucky or something :) Thanks in advance for your help!

https://wordpress.org/plugins/vaish-http-purge/