moriamo

So, I'm having this issue: I'm hosting a server to play with one friend Mod works perfectly but just for the first time we launch. We both can see each other flying into space and etc. But just until any of us revert the flight. After that we cant see each other anymore not even at space stage or orbits. Any clue on what is happening? We did not forget to sync. And we are not too far away from each other since we revert the flights together. btw, Happy New year