If you are using EvoCam and having it crash when trying to use more than one or two cameras it may be due to the Canvas Size you are using in the primary window. When opening a new window I found that you need to restore the primary window, which is a webcam in my case, to the webcam's native screen size before opening a new window. In the case of Logitech's QuickCam Pro 4000 the native canvas size would be 320X240. After restoring the primary window the the native canvas size in EvoCam you can open a new window and configure it to the camera you desire. Then you can go back and configure the primary window back to the canvas size that you were using initially. Don't forget to Save your settings.<br>