W520 webcam video doesnt "render" when have a second monitor plugged in.

Hi, when using the W520 on its own, i can use the webcam for skype no problem.
However, usually, I have a dell monitor plugged in, and only have the desktop on that.  When I try and make a video call, the green light comes on on the webcam, as per normal, but skype says: "can't start video renderer.  Check you've got a valid DirectX installation" which is different from cant find camera.   Its like there is a problem with the graphics drivers.
The monitor in question is a dell 30" beast.  I have no idea how to tell if its using the HD 3000 or the Quadra 2000N graphics card for the whole screen or for various applications on the screen, but it should not matter - both should support video display.
Windows 7 Pro.

According to google, there are quite a few similar cases. Iterestingly, about half of them seem to be with the new series of Lenovos, especially the X220. So either Lenovo have half the market share, or they are more prone to this issue than other machines. According to the rather lame Lenovo update checker, there are no available updates for drivers for my machine.

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