You didn't give us much to go on but the problem is probably that you have cameras in your pre-comp. When you collapse transformations and you have a 3D layer inside the pre-comp the main comps 3D camera is used and any camera in the nested comp will be ignored. You'll have to remove the camera in the nested comp.
If that is not what is going on then you'll have to provide a screenshot with all the properties in your pre-comp visible, with the layers revealed in your pre-comp, and an accurate description of your project.
Ok here goes. It's hard to explain as there's a lot going on.
There's no camera in my pre comp, but here is the basic details/ what makes the most sense.
These two are from within the precomp. This doesnt have a camera but items are set to 3d and rasterized where possible. You can see how when I select rasterise it just disappears. And you can also see how it needs to be rasterized.
These two pictures are from my master comp, this comp has the camera and controllers as you can see at the top, and also other comps in. The selected comp is the problem, it has the 3d and rasterize switches set too.
No idea whats going wrong here!
Thanks for your reply Rick
If the beams are created with the Beam effect on 2d layers, you can't use the continuously rasterize option on them. What you can do is apply that to a much larger solid and scale it down in the precomp.
Ok, so there is no way of scaling up the beam effect as is on the solid? ( I don't want to go in and start ruining hours of hard word!)
The reason I'm using this effect is because of the script, it uses the beam effect but also expressions to control the start and end points which I can't get the same control over other wise.
I shall have to have a play or get over it! I don't think it's THAT noticeable...