If you're stuck in a residential area, which I was, there's a simple fix to the 90k error. On the character screen, right click your name. Then, hit "Visit Another World Server", then wait for the the transfer to complete. Login normally, go to the aetheryte, and go back to your home server. Residential areas are not available currently, which means you can't port to your apartment, private, or fc estate until they're done.

Hope this helps!