Blur tool - not blurring!

Hi - i really hope someone can help.

I’ve got a strange problem with the blur tool. I have a movie clip that i have added a motion tween to and applied a blur to it - so the movie clip image blurs as it moves.

This was working perfectly when i first tested it and as i’ve continued with the creating the flash file and re-tested for some reason the blur is no longer displaying. It’s strange as it shows as blurred in the Flash file i’m editing but when i press F12 to display in a SWF it’s not blurring.

I’ve attached the file i’m working on - Can anyone help shed some light on this please?

Thanks
(using Flash 8).