Our engineers have completed the fix – the proper indexing based on user-defined locations should be correct for recent tweets forward now (Tweets that were already indexed prior to today’s fix are not being re-indexed retroactively).
Please keep in mind that you won’t see exactly the same behavior or result set breadth you may have been used to with the former geocoding provider we used – it’s likely you’ll see less results than you saw a month ago, but you’ll definitely see more than when we were in the buggy state last week.