Not sure exactly?

In one of the earlier game versions of Galciv3 i did frequently have custom ship designs vanish..... i think only after saving and reloading tho? So i would design a ship, it shows up in the list, i save the game, go to bed, next day reload, go to try to build that ship, its gone!!?? Never happens if i have built at least one of them tho.... oh but ones under construction don't stop the design vanishing, and then if i have the repeat construction on, it keeps building the ship with the vanished design, but if i halt the production and try to restart, i cannot, the design is not there! Funny.

i have not seen any designs vanish since 1.8 patch tho.