In the window frame to define zones no cam picture

[deune]

Hello ZoneMinder community
I ZoneMinder successfully installed and my four cameras also , these are certainly green !
In the window to to define zones I have , however, no image . What am I doing wrong?
The system runs on an Ubuntu 14:04:02 .
Greetings from Cologne, Germany
Holger

[mattionline]

Hast du die Pixel richtig eingestellt?
Ich glaube wenn man die falsch hat wirds Bild grün.