Can someone please explain how does locking/unlocking chips in the Vault work?
Yesterday, seeing that my balance was small, I decided to unlock my 2.5 chips to have more to play with.

So I did. And it looked like it went fine at first

but I didn't see any increase in my balance. And even today my balance is still the same as it was before the unlocking.
I think it has no use to unlock your chips, you can not play with it. By locking the chips in the vault, you make sure that you will receive a dividend (every 12hours) if the vault is positive.