I built a shipyard on my station and logged off after. After I logged on again, The shipyard just was not there, so I rebuilt it, but with same result. Somehow, the blocks, that I placed (Computer, anchor, modules and blocks in between these) just do not get saved even after typing the command "/force_save". Upon next connect to my server the shipyard is gone.
I have broken that issue down so far: After I place the shipyard computer (!) none of the subsequent blocks I place gets saved (and even some of the blocks, that I placed before).