I don't know if this is your problem, but i had a similar issue when the branch that another branch was stacked on was moved. Have a look at the .bzr/branch/branch.confs of the various involved branches and see if anything jumps out at you?
I don't know if this is your problem, but i had a similar issue when the branch that another branch was stacked on was moved. Have a look at the .bzr/branch/ branch. confs of the various involved branches and see if anything jumps out at you?