[1.10] unable to add ships in battle

because there aren’t any to choose from. There’s only the “design ship” button. I can design a new ship from scratch but it won’t turn up either. Loading saved deployments also doesn’t work. It’s a bit of a pity, really.

It sounds like you have changed the race for that mission and do not have any ships designed from your current race?

Indeed!I never thought of that.
However, as there is now a new tutorial mission, I could neither switch back to the Federation nor could choose any rebel hulls in the ship designer.
I edited one of the ship text files so that I could play the tutorial and now everything is fine again, thanks.
Great game, btw.