Kerbal Space Program

This is a complete rewrite of my original bug as I found more information. It appears that the Scanning Arm collider interferes with selecting a destination for crew transfers. If the arm is mounted too close to a crewable part that part cannot be selected as a destination for crew transfers. If the arm is moved far enough away then the part outside of the collider can be selected as a destination for crew transfers.

This can be a problem when there craft is relatively small relative to the arm's collider sphere. There may be no spot on a part clear of the collider that can be used to select the part as a destination for crew transfers and there's no indication either through error messages or on screen that there is a problem.

In the sample craft below transfers from the Hitchhiker to the Lander Can work always. Crew transfers from the Lander Can to the Hitchhiker only work if I select an spot towards the top of the Hitchiker clear of the arm's collider. I cannot select the Hitchhiker towards its bottom within the collider of the arm.