I found out what was going on. Alive Wikki shows clearly how it works. It's a little hard to undestand, cause, actually, I am pretty rookie in mission making. LOL! The fact is, we can't save using Arma default save cause Alive was not designed to work with default SP saves. I should have suspected this as modules suggest us to disable SP arma saving process (I used it without problems before because only player support modules was placed with Alive Required). If somebody have the same issue, here is what must be done: Need to check "persistent" on every module u want to keep saved and put down Data module. Instead of "server", select "headless client"; or something like that. Launch the mission and there it is! Alive menu with "save" feature activated. Thats the way u save your progress playing Alive SP mission without ruining everything. It's really fantastic. A lot better than Arma SP saving feature. Thanks Alive team for this incredible tool. :D