So, I think I finally figured out why my screen renders white sometimes.
I guess if you layer too many pngs on alpha on top of each other, the screen will begin to render white wherever the alpha channel is. I had a few issues with this before, but I could not figure it out.
For me, the alpha layers are giving out when 21 alpha layers are on top of each other.
I know that probably seems ridiculous, but it's much easier and faster to have all objects placed at 0,0 and put them on a transparent layer.
I think I will go in now and just put all of the images on green and not render that, but I'm not sure if it will work...
Has anyone else had issues with this? It's not because I'm out of memory is it? I don't really have the problem when I render on my machine, but it starts to crap out as soon as I upload it to portals.