I had the exact same problem, took a variety of re-sourcing my database to get it to run.
I believe it has something to do with the database changes from 5.6 to 5.7-DR2 (which I'm still trying to figure out).
To get it successfully working, I sourced the latest db.sql and dumpeditems.sql. Then I did a mass find\replace of "create table" and "insert into" to "alter table" and "replace into" on both alpha versions of the MW database.
Everything's running fine as of now (aside from a problem with external connections, but that's a network issue).
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