well, this is the first occurrence in a very long time (since beta if I am not mistaken), so I assume it might be a special case.
however, I need more information, including the date and time, character name, and the names of any other participants in that BDW.
I'm also wondering if changing the leader or kicking out players (through right click menu) works in BDW and JM.
we were meant to test it, but somehow it was forgotten along the way.. hopefully that was the reason you encountered the bug.