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IMAQ Overlay error on 8 bit image acquisition

Hi, I am using AVT camera Pike with Laview vision 2012

 

When I use Example code 'Grab and Attributes Setup.vi' (<NI supported Example),

I simply add the event case for overlay function (such as 'IMAQ Overlay Oval') with Image  by Local Variables connection (image input - output).

 

Event case:

 

             Image------[IMAQ Overlay Oval]--------Image

             Rectangle Control ---|

 

 

IMAQ Overlay should keep the overlay on buffer memory if I input the rectangle value.

 

Problem is that the overlay disappeared if I use 8 bit image format?.

Keep trying to change the Rectangle control value while grabbing video, the overlay disappear.

 

but at the 16bit image format, the image keep the overlay image (colored overlay).

It seems the overlay buffer is removed by acquiring new 8 bit image, but 16 bit format, the overlay is still alive. 

 

Is it bug or what am I wrong?  

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