Please specify exactly which controls you're clicking. I want to make sure that I know what you're referring to when you say "bump the project up to full res".
when I say "bump up to full res" I mean either select "full" as opposed to "quarter" "third" or "half" at the bottom of the preview
window, or else doing the same from within the composition settings.
A colleague created the composition and I think the problem must have originated at his end as his PC is fairly slow. The jpg image was very large indeed (24000x6000) and he has now cropped it, and it works fine.
He sent me the updated project file, and sure enough it works fine on mine as well, despite the fact that he didn't send me the cropped jpg. So my laptop is still using the same 24000x6000 jpg file, and now it's working!!
You're not using OpenGL for rendering, are you?
I'm 100% sure you were using OpenGL just like Todd said and your card simply isn't up to snuff...
You can't be 100% sure mate - because you're wrong :) The fault was the same on the old projects whether i used OpenGL or not, and the new projecfs are fine whetber I use OpenGL or not.
I'm having a similar issue, my comp has a precomped text and two illustrator layers animated with masks, also precomped. When I hit ram preview without using open gl the illustrator layers dissapear or sometimes "flash" multiple times; when i use open gl they render out fine.
however, when i render out a final movie file using the render queue, the illustrator layers dissapear in both cases.
I read in Creative Cow a similar case in which the illustrator layers had gradients applied to them. that was the case with mine, however i removed the gradients and applied a black fill, then added ramp effects to both layers in after effects, the issue still persists, could it be that I need to recreate the original illustrator file from scratch?
This might apply here, but this is a solve I found and posted to another thread.
I have found the genesis of our problems. I first noticed this on a project where I was using Illustrator (CS5) artwork supplied by a designer. He was using the "Film/Video" presets to make an HD formatted AI file. I liked how handy the grids and title safeties were so I kept using the preset on other projects. Thats when I started noticing artwork disappearing. I had to purge it at multiple points in my timeline just to get a render out.
When I read richardbwallace's idea to look for the second artboard and delete it, everything clicked into place. Instantly everything came back. I have a feeling that Adobe needed to add that artboard to make something in the film and video presets to work the way they do and didn't anticipate or test for this issue.
I have not checked if other presets use the same double artboard trick, but if one of them does, I bet it will cause the same problems.
tl;dr - Video and Film presets in AI add extra artboards which cause the issue.