[Orgmode] problem with nested lists.

[francois]

I am facing with a strange problem. Let's consider the following 
simple org file:

--8<--- beginning of my org file
- example
  - A
    - B
--8<--- end of my org file

when I press enter on the first level (example), the list is correctly folded. I
may press "enter" to unfold the first level. I get the level "A", but next I am
stuck at this level. It is impossible to reach the level B.

the org version that I use is 5.16a, my emacs is 22.1.1

thanks