Added a mount to a vehicle in orbit with an EVA Kerbal. On attempting to detach mount to relocate to a better position message "Dragged part is not allowed" is displayed, thus permanently locating the mount in the undesired location.

I have this bug too but for me it appears to be possible to scoop placed mount to inventory and place it somewhere else.

More interesting, sometimes I have stack overflow exception when moving container from side attachment to mount.

This message happen when you drag the mount to itself. I think it's the cause of the issue.
I added a check for the next version (1.0.1) to avoid this.

Also, stack overflow is related to #20