So and So is already a member of your crew....

[AdmiralSavvy]

I have this problem all the time. I would have a crew, after 15 mins, get booted, come back on, and when I recrew everyone, it says that they are already in. What I do the resolve this is make them leave the crew and everything is back to normal. Or very rarely, when I kick them out and reinvite them it works.