AE Problem - Not Rendering Effects?

Has anyone else had this problem?

I've had the problem using either Trapcode Shine or Magic Bullet Looks. I set up my effects as I would normally, RAM Preview them and they look great. But when I render them out the effects are 90% missing.

In the case of Trapcode Shine, I just see tiny little sparkles once in a while. No rays, no nothing.

In the case of Looks, I don't see any proper mixing. It has the look of the wrong composite setting on a layer (Normal instead of Overlay).

Here's where it really gets weird....

I tried rendering to different codecs (other than DV). When I rendered to ProRes, they looked great! So then I tried ProRes with interlace turned on, the problem came back. My effects always render correctly when rendering progressive but not interlaced. Here's what versions I'm running:

After Effects 8.0
Mac OS 10.5
Quicktime 7.6
MacPro Intel Quad Core 3.0Ghz
Ciprico fiber channel 2.5TB RAID

I'm guessing it's a problem with Quicktime 7.6. Anyone else having this problem? (anyone other than me render interlaced anymore? hehehehe)