Camtasia Mac Video flickers with Gaussian Blur

Hi
i did a couple of screen captures with camtasia mac.I exported my videos as 'uncompressed .mov'files.
In PP i added these files to my pal 720*576 project.I use anti flicker( 0.5) to get rid of the interlace flicker that appears unless i use anti flicker.
Anyway so far so good,when i now put Gaussian Blur on my source, the video flickers on my TV.it only flickers when the effect is on.hmmmmmm
Even if i leave it at its default settings(value=0),it flickers.Whyyyyy???????
Just to clarify,the video does not flicker without GB and only anti flicker on
I need GB to blur out some parts of the video.
if sb can explain this to me,i'd be very happy
thx in advance

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Hi Mike,
Okay, I have some new information that changes things. I misunderstood what the issue was from the designer. My apologies in advance for the confusion. There are actually two issues but they are somewhat related.
Issue 1:
We are concerned with banding on the outside of a spot color gradient with a gaussian blur over a patterned background of the same spot color. We do not know if this is becasue of the number of pixels on the blur, the version of Illustrator, the blending of the blur into the patterned background, etc... While the banding looks slight on screen it is more pronounced when printed. There are many variables and we have tried everything we can think of to create a smooth transition but we keep getting some banding.
The first image shows what happens when the Preserve Spot Colors in the Raster Effects Settings (found under the Effect menu) is unchecked. We believe that the spot color is being treated as CMYK and causing the blur to be a slightly different color than the spot color background thus causing the banding.
The second image shows what happens when we select Preserve Spot Colors. We lose the blur.
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Camtasia Mac Video flickers with Gaussian Blur

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