Let me remind this again:
If you think that there is a bug on the Duokan, then you should use the email: firstname.lastname@example.org
to notify the developers since Duokan team rarely visit this forum. (and I'm not a member of the Duokan Team
) (alternatively you can use their official English Blog: http://en.duokan.com
However it is good to send them here also to inform us (users).