I haven't studied the video driver code enough to know for sure, but here's
a possibility/guess:

Is the video input port set to use external (camera-generated) clocking/sync
(HSYNC/VSYNC come from camera)?

If so, what does the camera do when you close the lens? Does it emit
'black' frames (with HSYNC/VSYNC), or does it stop sending frames altogether
(you didn't say if you are just using a simple 'lens cap', or if it's an
integrated lens cover)?

If the camera stops sending sync signals, I can imagine that the DaVinci
video input drivers may have a problem with that.

Just a guess.

- Paul

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