Video not readin and not going on full screen

Hello,
On my cheap Androidbox PVR, I had XBMC 14 video working fine, but Backup not working and some features, so I decided to upgrade to KODI 16.1, all works fine, except that now when I read IPTV stream there is a sound and no video at all (even in System–System–Video setting I cannot find where to tune the settinfs such the video resolution ..etc)
Is it because of the configuration of my box? or is that a solution for this.
My box runing A9 dual core and Mali400 Graphics, and Android 4.2

Thanks for your help.