1) While interplanetary flight kerbal portarits are hollow
It doesn't disappear after reloading save or swithcing to map view and back, but after entering if planet sphere of influence
2) After docking 2 crafts, portraits of kerbals, who was on active (controlled) vessel, became gray and these kerbals didn't be on their seats in right top corner kerbal window. So you could see a seat, but not kerbal with gray portrait, who must be there
This problem disappeared after reloading save after docking