I am also having problems with the WIA WebCam source code. It does compile, but whenever I want to configure it (select the device), immediately after clicking on configure I get an exception:

Exception from HRESULT: 0x80210015
Source: Interop.WIA
at WIA.CommonDialogClass.ShowSelectDevice(...)

Anyone encountered this error? I use a Chicony TwinkleCam Pro DC2120 webcam. Also, it is listed in the "Scanners and Cameras" section of the Control Panel.

Does anyone know what the problem is? Sad