Everyone that is making questions about the PoS, i arealdy said here, we have found problem on PoS difficult retargeting and we arealdy updated it, the fix will start to work at block 12000, please update your wallet otherwise you will stake on the wrong chain.

Also, Mac wallet is Updated too.

https://github.com/aeriumcoin/Aerium/releases/download/v1.2/aerium-Qt.dmg

if this link above isnt working you can use this:

https://drive.google.com/open?id=1pEt5mZA1NQZreRJpCL_LldC5mIYko2P2