I have created a short 4 second comp and it all plays back fine until I actually try to render it. I've tried rendering the layer on it's own in a seperate comp and it disappears then as well and just becomes a white screen, but the original one when put into a comp works fine. I've spent hours editing it and putting it in place so i really don't want to start again.
I'm fairly new to after effects but I haven't been able to find the answer on any other discussions. Is this a glitch or have I done something wrong?
Which layer is disappearing? Your screenshot shows Precomp -1 as the active comp. Is that what you are rendering? If you are having problems with things like this the first thing to try is a test render with the effects turned off for the layer you are having problems with.
Things look fine but I can't tell what goes missing. A flow chart of the rendered comp may also help find the problem.
Any layer styles? Any other things we can't see?