For some reason, every time I try to update my wiki from 1.11 to 1.12, I end up getting a HTTP 500 error after the update and I have to manually restore a 9MB SQL backup line-by-line each time.
I am re-using the old LocalSettings.php and AdminSettings.php files. Is there some change that causes the old settings to fail? I don't recall having this issue on any previous upgrade.