I guess this one must have been already reported, but I didn't find it after a careful search.
I have used the mines of a Traitor Drone on a Rahanas that was isolated in a zone, but still in the zone. I then boarded the ship which was successful.
Now, maybe this was wrong, but I first have sent the Engineer inside the CAP, then the Captain and the Defense Officer, skipping the Guidance telling me to first send the captain.
Problem 1:
I realize that the captain tries to accomplish the last order that the ship had before the boarding (trading with a station in another sector) and it's NOT possible to give him any fleet orders, fly to, join my squad, leave my squad.
I then changed the captain with another and better one that I had on my Skunk (I play with MoreCrew mod) and the situation was resolved, the new captain accepting all orders.
The odd thing is: if I again change to the other captain (for selling my ship because I want to keep the better captain that I have trained), then I have the problem again and I CANNOT sell the ship if I go to the dealer.
Eventually, I fired the 'mutiner' captain and sold the ship with the better captain onboard

[Probably solved]
Problem 2: Ghost Captain
After a boarding, from the CAP, I have remotely called another captain that I had onboard the Skunk, I had to leave the bridge and return on the CAP to speak with the new captain. Now, I realize my other captain has VANISHED

If I change the captains from the Skunk instead, the captains change place normally without one vanishing.
My mods:
Litauen_Capital_Ship_Bridge
Mission_Computer_v133
Mission_Computer_Removal_v113
More_Crew_v135
Nidaren_Titurel_Engine_Fix_v106
w.e_BetterAutoAim
Is this due to a mod or is it a bug that will be eradicated in future patches?
Thanks,
XenonS