kdenlive 0.9.4 DVD wizard sometimes crashes

Thank you for this new version, that I was really waiting !

I have successfully created a DVD with a menu, using the DVD Wizard (with 0.9.2 the text of buttons was not printed).

But it was difficult: kdenlive crashed several times when I tried to move the menu buttons on the screen. It finally worked after 4 ou 5 tries, but I do not know why !

KUbuntu 12.10 64 bits