BGT: Minsc doesn't initiate the leaving dialogue!

Hello everyone I'd really appreciate some feedback on this problem:
I'm trying to kick Minsc from the group to add Viconia, but once I do add her Minsc starts walking towards my character and then doesn't initiate the leaving dialogue.
This means that he won't go to the Copper Coronet and that I won't be able to recruit him later on.

Any insights?