This issue really sucks, and it has proven difficult to track. Affected accounts just go quiet instead of having a useful error or message to identify them. However, from the reports we have seen and digging we have done so far, it looks like a small slice of players got dumped into this state during the August update, and new accounts created since then have been okay. Obviously it is still a huge pain point for those affected players, but the limited scope has an impact on the priority of this investigation when weighed against the entirety of the game.
However: If anyone has an account that was created after the August update and is affected by this issue, please let me know.
All of that said, we are aware of the issue, we are working on it, and we have scheduled a fix for the future.