I have the same problem.
it happens only on admin page and IE. without any problem on Opera and Firefox.
I checked. it's nothing with addons, but it's something like language file.
my IE somehow set to gb2312 when in admin page, so it show a blank page. but I found it has codes when view the source code. when I set it back to utf-8, it works fine.
I had tested all language, only happens on Chinese language.;-(
but I also think it's a problem of my IE browser.