Hi there. I am new with Tek-Tips. I have a problem with an application we are developping. There is a video preview dialog box that I can open with a click of a button. It activates a dialog box that streams from web cam. It works on the first time I have it open. When I close it, and then try to reopen the dialog box with the video preview, an error appears. I've narrowed down the error to the IvideoWindow:ut_Owner method. Problem is I am sure that I have returned the owner ship via IvideoWindow:ut_Owner(NULL) as instructed. Anyone have any ideas on what could cause this problem?