When selecting the preview mode to ML Grayscale the preview is still in colour when I press X5 Zoom/X3Crop mode.
Half-pressing the shutter just makes the picture go pink.
As a result it does not show the correct framing. When I get the mlv file on the computer there is a lot of extra space to the top and the left of the frame with the object being filmed, that was in the centre of the frame in the preview, is now towards the bottom right.
In a possibly related issue, sometimes when taking a silent picture the resulting DNG is pink.