I'm still wondering about this, since it sounds like its not working correctly here. What is the scale of pages in your site using the template 'cool-page' and what auto join fields does that template have? I'm just trying to find out as much info as possible to be able to reproduce it.
I think i know the issue... kinda wild tho - not sure if it's a buffering limit or what... as i'm on my localhost.. (shrug).
Its when I do var_dump of the 'children' objects, etc.. any time i seem/tend to dump that to the screen, then i'm seizing up the system, and it gives me the 'white-wall-of-doom!'
When i remove it, ir do the var_dump on anything else (obviously smaller than the children object array, etc...) it's all fine.
p.s. er so it seems