Just updated to the new DWC.
Webcam URL was missing, so i added that.
Now, there is a problem with the update interval. DWC doesn´t store a changed value. i change it to 1000ms and swap to the webcam. the image is updated every 5 seconds. so i jump back to "user interface" and the update interval is set to 5000ms.
Problem solved after instaling RC3!