Unfortunately, a white screen doesn't leave much to go on. You really need to turn up your error reporting and find out what error PHP is throwing. It could be a syntax error, a memory error, permissions error.. hard to say. But since it's not happening on any of the other installations, I think it's safe to say it's got something to do with your setup.
Do you have any logging set up? I can't imagine developing a website without some sort of error reporting. Do you just guess?