On Saturday evening (EDT) we noticed that any node running a Dash version prior to 0.12.0.58 (aka .58) was on the wrong chain. Our system worked as it was supposed to and moved all masternodes to the correct chain.
After confirming all Node40 masternodes were on the correct chain we decided to upgrade all nodes that were not on the current version. As of Saturday night, all Node40 masternodes are running Dash version 0.12.0.58.
If you have nodes hosted with Node40, no action is required. If you are not hosted at Node40, and your masternode has dropped offline, you are encouraged to upgrade as soon as possible.