Editing bridge crew roles

[Glksy]

I have a PC that had the helmsman role on my group's ship, but now I can't assign them to anything. When I try, it says "[PC name] is already assigned to [group's ship's name]," even though they aren't listed in any bridge crew role. Is there any way to manually remove PCs from roles so I can re-add them?

P.S. This module is simply fantastic, my whole group sends their thanks!

[Glksy]

D'oh, I just had to drag the PCs in question to the "unassigned" bridge role, that fixed it.