iMovie to FCPX 10.0.6 - flickering issues

Hi folks,

I'm trying to recreate a video I produced in iMovie in FCPX and it's giving me flickering problems, even flickering in the final rendered Apple 720p output file.

I'm running on a 2009 24" iMac (3.06GHz Core2Duo, 8GB RAM, 2TB external FW800).

My source video is 1080i and the flickering is appearing when I add a combination of the glow effect (100%) and reducing the saturation globally to 0.

Any ideas?


Cheers,
Rab

By the looks of it it was Time Machine running in the background which was messing with it. D'oh!