Figured the first two out. As I said before, now the login module won't load, but nothing is logged as an error
BTW, you can't get to event viewer if you can't log in so you have to look at the DB.
The login control simply won't load now, looking at the code I've added try/catches around the page_init and page_load, and that hasn't caught anything yet. I'm guessing the exception is happening further up the chain.
The part that sucks is that I did pull everything back and test the upgrade locally first, and that worked fine. Since I can't reproduce it locally, I can't debug it. I've been scratching my head for about 14 hours now, and I think it's time to sleep on it.
I did upload the folders from the full install after I couldn't get the upgrade working, so that's not applicable to me. I've scripted the stored procedures, functions and views from a working DB and updated the site DB with those on another suggestion, and that didn't get me anywhere. I'm thinking there is something seriously hosed in the production DB after the first failed upgrade, but reviewing all of the obvious tables hasn't led me to what it is...