Grrrr, well, from my previous post, Zero Editor IS now working again, and it is running well. But I attempted to edit my world, and it crashed whilst loading, so I took an old empty world, loaded it into Zero Editor and saved it as my new world name, enabling me to start from scratch on the world again.
But, now it will not let me load any layers apart from base into my world, and I cannot see any of my command posts as I do not have a conquest or a common layer. Why are these not loading now? It means I cannot see any of the command posts (I'm guesssing this is what caused the error) and therefore have no idea where to put boundaries, objects etc.
For those of you that want to know, I do not know why it crashed previously, it did not give me any significant errors in my log, just the usual assets geometry WILL BE SLOW errors.

i'v only been modding for a few days but it might work if you make a new layer and added your own cps.
to find out how to add cp's go to the getting started doc in the mod tools documentation. i dunno if this will fix but its worth a try......