I confirm that upgrading to bzr 1.14 makes it impossible to use an existing bzr+http server. So it's kind of a "big" bug.
Workaround : downgrading to 1.13
I confirm that upgrading to bzr 1.14 makes it impossible to use an existing bzr+http server. So it's kind of a "big" bug.
Workaround : downgrading to 1.13