Hi FM,
that's exactly my experience with the half moon cover and also my concerns with the plastic lugs.
It's interesting that after a couple of seconds you get 'no signal' as I just get the normal 'Camera' message suggesting that it's just the cover that not moving out of the way which is a fault.
The half moon insert is the same on the US VX so hopefully the guys can give advice. It might be that this issue is raised on another thread (ie not this JDM thread)
Kirk