[Snapshot Pro] My site only works when Snapshot is enabled. Conflict with mu-plugin.

Through a plugin conflict test, I have discovered that my entire site breaks (500) when Snapshot is not enabled. Turns out, there is a line in a mu-plugin which throws an error ONLY when Snapshot is disabled. Now I am trying to sort out the connection between the two. Since this will require providing a lot more detail, I am going to submit this post, then return and add to it.