Clef collides with the time signature after hiding it

GIT commit: f7d9650 / Windows7

1) "My First Score"
2) Select the time signature
3) Press "V" (-> escape)

Result: the time sig collides with the clef:

- Other scenario
1) Create a new score for multiple instruments, eg a flute quatuor: flute quatuor.mscz
2) Hide ("V") the time signature in each staff the one after the other

Result: it works for the three first staves

But not when applying this invisibility in the last staff (same thing if two instruments, or five and so on.)