"Create clef for all systems" not working properly when unchecked

Steps:

1- Create a new score with a lot of measures, so that it spans over two or more systems;
2- Uncheck "Style > General > Page > Create clef for all systems"
Result:
- The clef in the first system disappears; the clefs in all other systems are still visible. See attachment.
Expected:
- The clef in the first system is visible; the clefs in all other systems disappear.

OS: Windows XP SP3
Personal build 930f43d