Before I go in and report it as a bug, is it intentional that only one player get the unlocked ship in a multiplayer game when you use a ship design hacker? When we just capture the ARS, we both get the default unlock, but only the person who actually claims the planet seems to get the hacked option and unlock. If this is intentional, it might be nice to have some info to that effect on the wiki or in game. If it's a bug, well, then I'm happy to report it as such!
Cheers,
Dave