I think the exchange is broken. It's been 19 hours and I still haven't got a single sia coin since I set to auto-exchange last night.
Plus, I've been seeing the currencies mined being transfered to the exchange and then vanish never to return.
You can see a few hours difference between this screenshots:
https://i.imgur.com/J1bybDD.png
https://i.imgur.com/j0UN1so.png

Currencies going out, none getting in. 19 hours and 0 sia coins.