It's almost certainly a memory problem. How much do you have?
It'd be interesting to monitor it in Task Manager and see how much each process is using. I have no idea how much LPub3D uses, but I suspect quit a bit since it's built with a modern toolkit. Ldglite is pretty frugal with the memory, but I've only tried a few really large models in it. Anyhow, if LPub3D eats all the memory there's not much hope that either ldglite or LDView will be able to render.
It'd be interesting to monitor it in Task Manager and see how much each process is using. I have no idea how much LPub3D uses, but I suspect quit a bit since it's built with a modern toolkit. Ldglite is pretty frugal with the memory, but I've only tried a few really large models in it. Anyhow, if LPub3D eats all the memory there's not much hope that either ldglite or LDView will be able to render.