Hi Mineriapepe,

Locking the payment address is recommended, so kudos for securing your account!

However, we don't have a function to lock the auto-payout threshold. There are a few restrictions to the threshold:
* The amount must be higher than 0.2 BTC. If you enter a lower number it will be changed to 0 (0=disable auto payout)
* The amount must be lower than 5 BTC. If you enter a higher number it will be changed to 5.
* You must enter your PIN. If you don't enter the PIN the changes won't be saved.

What is the amount you are trying to set it to? What is the message that is returned at the top of the page when you try?
Seen it, thanks for responding!