It looks like we're having a problem with our Space Engineers server. @Nizzura made me aware of this yesterday. When you log in, it seems like an empty world and it is not possible to spawn in your ship or find it at all. I have been trying to solve the issue, but at this time its not possible. I have even used a backup from 3 weeks ago, with the same result, so the save file isn't corrupted, but it has something to do with the server. I have no error log to go from, so it can be a bit hard to fix at this moment.
As of now I can see every ship and station when looking through the world file, so nothing has been deleted.
We are going to wipe the server very soon, probably next week when the stable version has been released.
Sorry about this :)
i7-9700K @ 3.6 GHz - Nvidia GTX 1080 (Strix OC edition) - 16 GB RAM - 4,5 TB HD - ASUS RoG SWIFT PG278Q, 2560x1440 @ 144 Hz