"o" key not working

Typing text (lyrics, staff, etc...) the "o" key delivers no caracter, but the "O" does. I have to paste the "o" from the F2 palette.
This happens with french or english(UK) localisation.

Ubuntu 10.04 Mscore nightlybuild 3922M and 3926M

but 3831M does deliver normal "o"

at your disposal to check intermediate versions for the apparition of the bug