11.04 - I can't create bootable USB drive with Startup Disk Creator

After re-installation of Natty, I had lost ability to create bootable USB drive with Startup Disk Creator.

When I tried to add an .iso image into (through the button Other), nothing happend.

Disk Creator won't add the source CD image.

I have tried to re-install Startup Disk Creator, but it doesn't help.