jfbterm kills me

To prepare d-i rc3, I tried current snapshot on my VMware.
I installed linux24... smoothly, nice.
Next, linux26... Doh! It shows only black screen on 2nd stage.
I investigated what was happen and noticed jfbterm won't exit when called program had already been exitted. 0.4.7-1 has something wrong. I talked with maintainer Fumitoshi and I'm trying to solve this bug with him.